Field Crops

CORN INSECT CONTROL RECOMMENDATIONS

Christian H. Krupke and John L. Obermeyer, Extension Entomologists

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This publication is intended to aid pest managers in treating pest infestations in corn during the growing season and in situations where replanting is needed. Consequently, many current preventative pest management decisions that are made pre-planting (e.g., Bt traited hybrids) are not included in this list.

Pest	Active Ingredient(s)	Trade Name(s)	Pre-Harvest Interval (days)	MoA¹	Treatment Guideline
Armyworm species	alpha-cypermethrin*	Fastac	30	3	Seedling feeding: Greater than 50% of the plants show fresh feeding and the larvae are less than 1-1/4” long. Whorl feeding: more than 75% of plants show whorl feeding, plants are stressed, and larvae less than 1-1/4” long.
	Armyworm species	beta-cyfluthrin*	Baythroid	21		3	Greater than 50% of the plants show fresh feeding and the larvae are less than 1-1/4” long. Whorl feeding: more than 75% of plants show whorl feeding, plants are stressed, and larvae less than 1-1/4” long.
	Armyworm species	bifenthrin*	Capture, generics	30		3	Greater than 50% of the plants show fresh feeding and the larvae are less than 1-1/4” long. Whorl feeding: more than 75% of plants show whorl feeding, plants are stressed, and larvae less than 1-1/4” long.
	Armyworm species	cyfluthrin*	Tombstone	21		3	Greater than 50% of the plants show fresh feeding and the larvae are less than 1-1/4” long. Whorl feeding: more than 75% of plants show whorl feeding, plants are stressed, and larvae less than 1-1/4” long.
	Armyworm species	deltamethrin*	Delta Gold, generics	21		3	Greater than 50% of the plants show fresh feeding and the larvae are less than 1-1/4” long. Whorl feeding: more than 75% of plants show whorl feeding, plants are stressed, and larvae less than 1-1/4” long.
	Armyworm species	esfenvalerate*	Asana, generics	21		3	Greater than 50% of the plants show fresh feeding and the larvae are less than 1-1/4” long. Whorl feeding: more than 75% of plants show whorl feeding, plants are stressed, and larvae less than 1-1/4” long.
	Armyworm species	gamma-cyhalothrin*	Declare, Proaxis	21		3	Greater than 50% of the plants show fresh feeding and the larvae are less than 1-1/4” long. Whorl feeding: more than 75% of plants show whorl feeding, plants are stressed, and larvae less than 1-1/4” long.
	Armyworm species	indoxacarb	Steward	1		22A	Greater than 50% of the plants show fresh feeding and the larvae are less than 1-1/4” long. Whorl feeding: more than 75% of plants show whorl feeding, plants are stressed, and larvae less than 1-1/4” long.
	Armyworm species	lambda-cyhalothrin*	Warrior II, generics	21		3	Greater than 50% of the plants show fresh feeding and the larvae are less than 1-1/4” long. Whorl feeding: more than 75% of plants show whorl feeding, plants are stressed, and larvae less than 1-1/4” long.
	Armyworm species	methoxyfenozide	Intrepid, generics	21		18	Greater than 50% of the plants show fresh feeding and the larvae are less than 1-1/4” long. Whorl feeding: more than 75% of plants show whorl feeding, plants are stressed, and larvae less than 1-1/4” long.
	Armyworm species	permethrin*	Pounce, generics	30		3A	Greater than 50% of the plants show fresh feeding and the larvae are less than 1-1/4” long. Whorl feeding: more than 75% of plants show whorl feeding, plants are stressed, and larvae less than 1-1/4” long.
	Armyworm species	spinetoram	Radiant	28		5	Greater than 50% of the plants show fresh feeding and the larvae are less than 1-1/4” long. Whorl feeding: more than 75% of plants show whorl feeding, plants are stressed, and larvae less than 1-1/4” long.
	Armyworm species	spinosad	Entrust, generics	28		5	Greater than 50% of the plants show fresh feeding and the larvae are less than 1-1/4” long. Whorl feeding: more than 75% of plants show whorl feeding, plants are stressed, and larvae less than 1-1/4” long.
	Armyworm species	zeta-cypermethrin*	Mustang Max	7		3	Greater than 50% of the plants show fresh feeding and the larvae are less than 1-1/4” long. Whorl feeding: more than 75% of plants show whorl feeding, plants are stressed, and larvae less than 1-1/4” long.
	Armyworm species	Pre-Mixes
	Armyworm species	lambda-cyhalothrin; chlorantraniliprole*	Besiege	21		3;28	Greater than 50% of the plants show fresh feeding and the larvae are less than 1-1/4” long. Whorl feeding: more than 75% of plants show whorl feeding, plants are stressed, and larvae less than 1-1/4” long.
Cutworms (Black, Dingy, Variegated, Claybacked)	alpha-cypermethrin*	Fastac	30	3		Post emergence: 3-5% of the plants show damage, 2 or more larvae are found per 100 plants and larvae are 1/2 to 1-1/2” long.
	Cutworms (Black, Dingy, Variegated, Claybacked)	beta-cyfluthrin*	Baythroid	21	3		Post emergence: 3-5% of the plants show damage, 2 or more larvae are found per 100 plants and larvae are 1/2 to 1-1/2” long.
	Cutworms (Black, Dingy, Variegated, Claybacked)	bifenthrin*	Capture, generics	30	3		Post emergence: 3-5% of the plants show damage, 2 or more larvae are found per 100 plants and larvae are 1/2 to 1-1/2” long.
	Cutworms (Black, Dingy, Variegated, Claybacked)	cyfluthrin*	Tombstone	21	3		Post emergence: 3-5% of the plants show damage, 2 or more larvae are found per 100 plants and larvae are 1/2 to 1-1/2” long.
	Cutworms (Black, Dingy, Variegated, Claybacked)	deltamethrin*	Delta Gold	21	3		Post emergence: 3-5% of the plants show damage, 2 or more larvae are found per 100 plants and larvae are 1/2 to 1-1/2” long.
	Cutworms (Black, Dingy, Variegated, Claybacked)	esfenvalerate*	Asana, generics	21	3		Post emergence: 3-5% of the plants show damage, 2 or more larvae are found per 100 plants and larvae are 1/2 to 1-1/2” long.
	Cutworms (Black, Dingy, Variegated, Claybacked)	gamma-cyhalothrin*	Declare, Proaxis	21	3		Post emergence: 3-5% of the plants show damage, 2 or more larvae are found per 100 plants and larvae are 1/2 to 1-1/2” long.
	Cutworms (Black, Dingy, Variegated, Claybacked)	lambda-cyhalothrin*	Warrior II, generics	21	3		Post emergence: 3-5% of the plants show damage, 2 or more larvae are found per 100 plants and larvae are 1/2 to 1-1/2” long.
	Cutworms (Black, Dingy, Variegated, Claybacked)	methoxyfenozide	Intrepid, generics	21	18		Post emergence: 3-5% of the plants show damage, 2 or more larvae are found per 100 plants and larvae are 1/2 to 1-1/2” long.
	Cutworms (Black, Dingy, Variegated, Claybacked)	permethrin*	Pounce, generics	30	3A		Post emergence: 3-5% of the plants show damage, 2 or more larvae are found per 100 plants and larvae are 1/2 to 1-1/2” long.
	Cutworms (Black, Dingy, Variegated, Claybacked)	zeta-cypermethrin*	Mustang Max, Respect	7	3		Post emergence: 3-5% of the plants show damage, 2 or more larvae are found per 100 plants and larvae are 1/2 to 1-1/2” long.
	Cutworms (Black, Dingy, Variegated, Claybacked)	Pre-Mixes
	Cutworms (Black, Dingy, Variegated, Claybacked)	lambda-cyhalothrin; chlorantraniliprole*	Besiege	21	3;28		Post emergence: 3-5% of the plants show damage, 2 or more larvae are found per 100 plants and larvae are 1/2 to 1-1/2” long.
Brown Stink Bug	alpha-cypermethrin*	Fastac	30	3	Control may be needed if seedling plants are emerging from poorly closed seed slots and being damaged and/or killed.
	Brown Stink Bug	beta-cyfluthrin*	Baythroid	21		3	Control may be needed if seedling plants are emerging from poorly closed seed slots and being damaged and/or killed.
	Brown Stink Bug	bifenthrin*	Capture, generics	30		3	Control may be needed if seedling plants are emerging from poorly closed seed slots and being damaged and/or killed.
	Brown Stink Bug	cyfluthrin*	Tombstone	21		3	Control may be needed if seedling plants are emerging from poorly closed seed slots and being damaged and/or killed.
	Brown Stink Bug	deltamethrin*	Delta Gold, generics	21		3	Control may be needed if seedling plants are emerging from poorly closed seed slots and being damaged and/or killed.
	Brown Stink Bug	esfenvalerate*	Asana, generics	21		3	Control may be needed if seedling plants are emerging from poorly closed seed slots and being damaged and/or killed.
	Brown Stink Bug	gamma-cyhalothrin*	Declare, Proaxis	21		3	Control may be needed if seedling plants are emerging from poorly closed seed slots and being damaged and/or killed.
	Brown Stink Bug	lambda-cyhalothrin*	Warrior II, generics	21		3	Control may be needed if seedling plants are emerging from poorly closed seed slots and being damaged and/or killed.
	Brown Stink Bug	zeta-cypermethrin*	Mustang Max, Respect	7		3	Control may be needed if seedling plants are emerging from poorly closed seed slots and being damaged and/or killed.
	Brown Stink Bug	Pre-Mixes
	Brown Stink Bug	lambda-cyhalothrin; chlorantraniliprole*	Besiege	21		3;28	Control may be needed if seedling plants are emerging from poorly closed seed slots and being damaged and/or killed.

Corn Earworm	alpha-cypermethrin*	Fastac	30	3	Control is only economically justified on seed, sweet, or popcorn. Treat if 10 or more moths for several consecutive nights are captured in an earworm pheronmone trap just before or during silking.
	Corn Earworm	beta-cyfluthrin*	Baythroid	21		3	Control is only economically justified on seed, sweet, or popcorn. Treat if 10 or more moths for several consecutive nights are captured in an earworm pheronmone trap just before or during silking.
	Corn Earworm	bifenthrin*	Capture, generics	30		3	Control is only economically justified on seed, sweet, or popcorn. Treat if 10 or more moths for several consecutive nights are captured in an earworm pheronmone trap just before or during silking.
	Corn Earworm	chlorantraniliprole	Coragen	14		28	Control is only economically justified on seed, sweet, or popcorn. Treat if 10 or more moths for several consecutive nights are captured in an earworm pheronmone trap just before or during silking.
	Corn Earworm	cyfluthrin*	Tombstone	21		3	Control is only economically justified on seed, sweet, or popcorn. Treat if 10 or more moths for several consecutive nights are captured in an earworm pheronmone trap just before or during silking.
	Corn Earworm	deltamethrin*	Delta Gold, generics	21		3	Control is only economically justified on seed, sweet, or popcorn. Treat if 10 or more moths for several consecutive nights are captured in an earworm pheronmone trap just before or during silking.
	Corn Earworm	esfenvalerate*	Asana, generics	21		3	Control is only economically justified on seed, sweet, or popcorn. Treat if 10 or more moths for several consecutive nights are captured in an earworm pheronmone trap just before or during silking.
	Corn Earworm	gamma-cyhalothrin*	Declare, Proaxis	21		3	Control is only economically justified on seed, sweet, or popcorn. Treat if 10 or more moths for several consecutive nights are captured in an earworm pheronmone trap just before or during silking.
	Corn Earworm	indoxacarb	Steward	1		22A	Control is only economically justified on seed, sweet, or popcorn. Treat if 10 or more moths for several consecutive nights are captured in an earworm pheronmone trap just before or during silking.
	Corn Earworm	lambda-cyhalothrin*	Warrior II, generics	21		3	Control is only economically justified on seed, sweet, or popcorn. Treat if 10 or more moths for several consecutive nights are captured in an earworm pheronmone trap just before or during silking.
	Corn Earworm	spinsosad	Entrust, generics	28		5	Control is only economically justified on seed, sweet, or popcorn. Treat if 10 or more moths for several consecutive nights are captured in an earworm pheronmone trap just before or during silking.
	Corn Earworm	zeta-cypermethrin*	Mustang Max, Respect	7		3	Control is only economically justified on seed, sweet, or popcorn. Treat if 10 or more moths for several consecutive nights are captured in an earworm pheronmone trap just before or during silking.
	Corn Earworm	Pre-Mixes
	Corn Earworm	lambda-cyhalothrin; chlorantraniliprole*	Besiege	21		3;28	Control is only economically justified on seed, sweet, or popcorn. Treat if 10 or more moths for several consecutive nights are captured in an earworm pheronmone trap just before or during silking.
Corn Flea Beetle	alpha-cypermethrin*	Fastac	30	3		5 or more beetles per plant, 50% of seedlings are severely damaged, and plants are under additional stress(es).
	Corn Flea Beetle	beta-cyfluthrin*	Baythroid	21	3		5 or more beetles per plant, 50% of seedlings are severely damaged, and plants are under additional stress(es).
	Corn Flea Beetle	bifenthrin*	Capture, generics	30	3		5 or more beetles per plant, 50% of seedlings are severely damaged, and plants are under additional stress(es).
	Corn Flea Beetle	carbaryl	Sevin, Carbaryl, generics	48	1A		5 or more beetles per plant, 50% of seedlings are severely damaged, and plants are under additional stress(es).
	Corn Flea Beetle	cyfluthrin*	Tombstone	21	3		5 or more beetles per plant, 50% of seedlings are severely damaged, and plants are under additional stress(es).
	Corn Flea Beetle	deltamethrin*	Delta Gold, generics	21	3		5 or more beetles per plant, 50% of seedlings are severely damaged, and plants are under additional stress(es).
	Corn Flea Beetle	esfenvalerate*	Asana, generics	21	3		5 or more beetles per plant, 50% of seedlings are severely damaged, and plants are under additional stress(es).
	Corn Flea Beetle	gamma-cyhalothrin*	Declare, Proaxis	21	3		5 or more beetles per plant, 50% of seedlings are severely damaged, and plants are under additional stress(es).
	Corn Flea Beetle	lambda-cyhalothrin*	Warrior II, generics	21	3		5 or more beetles per plant, 50% of seedlings are severely damaged, and plants are under additional stress(es).
	Corn Flea Beetle	permethrin*	Ambush, Pounce, generics	30	3A		5 or more beetles per plant, 50% of seedlings are severely damaged, and plants are under additional stress(es).
	Corn Flea Beetle	zeta-cypermethrin*	Mustang Max, Respect	7	3		5 or more beetles per plant, 50% of seedlings are severely damaged, and plants are under additional stress(es).
	Corn Flea Beetle	Pre-Mixes
	Corn Flea Beetle	lambda-cyhalothrin; chlorantraniliprole*	Besiege	21	3;28		5 or more beetles per plant, 50% of seedlings are severely damaged, and plants are under additional stress(es).
Corn Leaf Aphid	dimethoate	Dimethoate, Dimate	28	1B	Pre-tassel: 15 aphids/plant whorl 3 weeks before tasseling and plants under moisture stress. Post-tassel: 50% of tassels covered prior to 50% pollination and plants under moisture stress.
	Corn Leaf Aphid	Pre-Mixes
	Corn Leaf Aphid	lambda-cyhalothrin; chlorantraniliprole*	Besiege	21		3;28	Pre-tassel: 15 aphids/plant whorl 3 weeks before tasseling and plants under moisture stress. Post-tassel: 50% of tassels covered prior to 50% pollination and plants under moisture stress.
Corn Rootworm Beetles	alpha-cypermethrin*	Fastac	30	3		When tassels are shedding pollen and green silk is continuously clipped back to 1/2 inch or less before 50% pollination has taken place and beetles are present.
	Corn Rootworm Beetles	beta-cyfluthrin*	Baythroid	21	3		When tassels are shedding pollen and green silk is continuously clipped back to 1/2 inch or less before 50% pollination has taken place and beetles are present.
	Corn Rootworm Beetles	bifenthrin*	Capture, generics	30	3		When tassels are shedding pollen and green silk is continuously clipped back to 1/2 inch or less before 50% pollination has taken place and beetles are present.
	Corn Rootworm Beetles	cyfluthrin*	Tombstone	21	3		When tassels are shedding pollen and green silk is continuously clipped back to 1/2 inch or less before 50% pollination has taken place and beetles are present.
	Corn Rootworm Beetles	deltamethrin*	Delta Gold, generics	21	3		When tassels are shedding pollen and green silk is continuously clipped back to 1/2 inch or less before 50% pollination has taken place and beetles are present.
	Corn Rootworm Beetles	esfenvalerate*	Asana, generics	21	3		When tassels are shedding pollen and green silk is continuously clipped back to 1/2 inch or less before 50% pollination has taken place and beetles are present.
	Corn Rootworm Beetles	gamma-cyhalothrin*	Declare, Proaxis	21	3		When tassels are shedding pollen and green silk is continuously clipped back to 1/2 inch or less before 50% pollination has taken place and beetles are present.
	Corn Rootworm Beetles	indoxacarb	Steward	1	22A		When tassels are shedding pollen and green silk is continuously clipped back to 1/2 inch or less before 50% pollination has taken place and beetles are present.
	Corn Rootworm Beetles	lambda-cyhalothrin*	Warrior II, generics	21	3		When tassels are shedding pollen and green silk is continuously clipped back to 1/2 inch or less before 50% pollination has taken place and beetles are present.
	Corn Rootworm Beetles	permethrin*	Pounce, generics	30	3A		When tassels are shedding pollen and green silk is continuously clipped back to 1/2 inch or less before 50% pollination has taken place and beetles are present.
	Corn Rootworm Beetles	zeta-cypermethrin*	Mustang Max, Respect	7	3		When tassels are shedding pollen and green silk is continuously clipped back to 1/2 inch or less before 50% pollination has taken place and beetles are present.
	Corn Rootworm Beetles	Pre-Mixes
	Corn Rootworm Beetles	lambda-cyhalothrin; chlorantraniliprole*	Besiege	21	3;28		When tassels are shedding pollen and green silk is continuously clipped back to 1/2 inch or less before 50% pollination has taken place and beetles are present.
Corn Borer: European and Southwestern	alpha-cypermethrin*	Fastac	30	3	European corn borer: base controls on anticipated yield, level of infestation, number of larvae per plant, corn growth stage, expected level of control, and cost of product and application. Refer to Field Crops IPM website http://www.entm.purdue.edu/fieldcropsipm/. Southwestern corn borer: First generation - at or just before 35% of the plants show fresh whorl feeding and live larvae are present. Second generation - controls are less effective and generally not economical for field corn.
	Corn Borer: European and Southwestern	Bacillus thuringiensis	Dipel, Agree, generics	0		11A	European corn borer: base controls on anticipated yield, level of infestation, number of larvae per plant, corn growth stage, expected level of control, and cost of product and application. Refer to Field Crops IPM website http://www.entm.purdue.edu/fieldcropsipm/. Southwestern corn borer: First generation - at or just before 35% of the plants show fresh whorl feeding and live larvae are present. Second generation - controls are less effective and generally not economical for field corn.
	Corn Borer: European and Southwestern	beta-cyfluthrin*	Baythroid	21		3	European corn borer: base controls on anticipated yield, level of infestation, number of larvae per plant, corn growth stage, expected level of control, and cost of product and application. Refer to Field Crops IPM website http://www.entm.purdue.edu/fieldcropsipm/. Southwestern corn borer: First generation - at or just before 35% of the plants show fresh whorl feeding and live larvae are present. Second generation - controls are less effective and generally not economical for field corn.
	Corn Borer: European and Southwestern	bifenthrin*	Capture, generics	30		3	European corn borer: base controls on anticipated yield, level of infestation, number of larvae per plant, corn growth stage, expected level of control, and cost of product and application. Refer to Field Crops IPM website http://www.entm.purdue.edu/fieldcropsipm/. Southwestern corn borer: First generation - at or just before 35% of the plants show fresh whorl feeding and live larvae are present. Second generation - controls are less effective and generally not economical for field corn.
	Corn Borer: European and Southwestern	carbaryl	Sevin, Carbaryl, generics	48		1A	European corn borer: base controls on anticipated yield, level of infestation, number of larvae per plant, corn growth stage, expected level of control, and cost of product and application. Refer to Field Crops IPM website http://www.entm.purdue.edu/fieldcropsipm/. Southwestern corn borer: First generation - at or just before 35% of the plants show fresh whorl feeding and live larvae are present. Second generation - controls are less effective and generally not economical for field corn.
	Corn Borer: European and Southwestern	chlorantraniliprole	Coragen	14		28	European corn borer: base controls on anticipated yield, level of infestation, number of larvae per plant, corn growth stage, expected level of control, and cost of product and application. Refer to Field Crops IPM website http://www.entm.purdue.edu/fieldcropsipm/. Southwestern corn borer: First generation - at or just before 35% of the plants show fresh whorl feeding and live larvae are present. Second generation - controls are less effective and generally not economical for field corn.
	Corn Borer: European and Southwestern	cyfluthrin*	Tombstone	21		3	European corn borer: base controls on anticipated yield, level of infestation, number of larvae per plant, corn growth stage, expected level of control, and cost of product and application. Refer to Field Crops IPM website http://www.entm.purdue.edu/fieldcropsipm/. Southwestern corn borer: First generation - at or just before 35% of the plants show fresh whorl feeding and live larvae are present. Second generation - controls are less effective and generally not economical for field corn.
	Corn Borer: European and Southwestern	deltamethrin*	Delta Gold, generics	21		3	European corn borer: base controls on anticipated yield, level of infestation, number of larvae per plant, corn growth stage, expected level of control, and cost of product and application. Refer to Field Crops IPM website http://www.entm.purdue.edu/fieldcropsipm/. Southwestern corn borer: First generation - at or just before 35% of the plants show fresh whorl feeding and live larvae are present. Second generation - controls are less effective and generally not economical for field corn.
	Corn Borer: European and Southwestern	esfenvalerate*	Asana, generics	21		3	European corn borer: base controls on anticipated yield, level of infestation, number of larvae per plant, corn growth stage, expected level of control, and cost of product and application. Refer to Field Crops IPM website http://www.entm.purdue.edu/fieldcropsipm/. Southwestern corn borer: First generation - at or just before 35% of the plants show fresh whorl feeding and live larvae are present. Second generation - controls are less effective and generally not economical for field corn.
	Corn Borer: European and Southwestern	gamma-cyhalothrin*	Declare, Proaxis	21		3	European corn borer: base controls on anticipated yield, level of infestation, number of larvae per plant, corn growth stage, expected level of control, and cost of product and application. Refer to Field Crops IPM website http://www.entm.purdue.edu/fieldcropsipm/. Southwestern corn borer: First generation - at or just before 35% of the plants show fresh whorl feeding and live larvae are present. Second generation - controls are less effective and generally not economical for field corn.
	Corn Borer: European and Southwestern	indoxacarb	Steward	1		22A	European corn borer: base controls on anticipated yield, level of infestation, number of larvae per plant, corn growth stage, expected level of control, and cost of product and application. Refer to Field Crops IPM website http://www.entm.purdue.edu/fieldcropsipm/. Southwestern corn borer: First generation - at or just before 35% of the plants show fresh whorl feeding and live larvae are present. Second generation - controls are less effective and generally not economical for field corn.
	Corn Borer: European and Southwestern	lambda-cyhalothrin*	Warrior II, generics	21		3	European corn borer: base controls on anticipated yield, level of infestation, number of larvae per plant, corn growth stage, expected level of control, and cost of product and application. Refer to Field Crops IPM website http://www.entm.purdue.edu/fieldcropsipm/. Southwestern corn borer: First generation - at or just before 35% of the plants show fresh whorl feeding and live larvae are present. Second generation - controls are less effective and generally not economical for field corn.
	Corn Borer: European and Southwestern	methoxyfenozide	Intrepid, generics	21		18	European corn borer: base controls on anticipated yield, level of infestation, number of larvae per plant, corn growth stage, expected level of control, and cost of product and application. Refer to Field Crops IPM website http://www.entm.purdue.edu/fieldcropsipm/. Southwestern corn borer: First generation - at or just before 35% of the plants show fresh whorl feeding and live larvae are present. Second generation - controls are less effective and generally not economical for field corn.
	Corn Borer: European and Southwestern	permethrin*	Pounce, generics	30		3A	European corn borer: base controls on anticipated yield, level of infestation, number of larvae per plant, corn growth stage, expected level of control, and cost of product and application. Refer to Field Crops IPM website http://www.entm.purdue.edu/fieldcropsipm/. Southwestern corn borer: First generation - at or just before 35% of the plants show fresh whorl feeding and live larvae are present. Second generation - controls are less effective and generally not economical for field corn.
	Corn Borer: European and Southwestern	spinetoram	Radiant	28		5	European corn borer: base controls on anticipated yield, level of infestation, number of larvae per plant, corn growth stage, expected level of control, and cost of product and application. Refer to Field Crops IPM website http://www.entm.purdue.edu/fieldcropsipm/. Southwestern corn borer: First generation - at or just before 35% of the plants show fresh whorl feeding and live larvae are present. Second generation - controls are less effective and generally not economical for field corn.
	Corn Borer: European and Southwestern	spinosad	Entrust, generics	28		5	European corn borer: base controls on anticipated yield, level of infestation, number of larvae per plant, corn growth stage, expected level of control, and cost of product and application. Refer to Field Crops IPM website http://www.entm.purdue.edu/fieldcropsipm/. Southwestern corn borer: First generation - at or just before 35% of the plants show fresh whorl feeding and live larvae are present. Second generation - controls are less effective and generally not economical for field corn.
	Corn Borer: European and Southwestern	zeta-cypermethrin*	Mustang Max, Respect	7		3	European corn borer: base controls on anticipated yield, level of infestation, number of larvae per plant, corn growth stage, expected level of control, and cost of product and application. Refer to Field Crops IPM website http://www.entm.purdue.edu/fieldcropsipm/. Southwestern corn borer: First generation - at or just before 35% of the plants show fresh whorl feeding and live larvae are present. Second generation - controls are less effective and generally not economical for field corn.
	Corn Borer: European and Southwestern	Pre-Mixes
	Corn Borer: European and Southwestern	lambda-cyhalothrin; chlorantraniliprole*	Besiege	21		3;28	European corn borer: base controls on anticipated yield, level of infestation, number of larvae per plant, corn growth stage, expected level of control, and cost of product and application. Refer to Field Crops IPM website http://www.entm.purdue.edu/fieldcropsipm/. Southwestern corn borer: First generation - at or just before 35% of the plants show fresh whorl feeding and live larvae are present. Second generation - controls are less effective and generally not economical for field corn.
Grasshopper	alpha-cypermethrin*	Fastac	30	3		Treat field borders if about 8 or more adults or 15 or more nymphs/square yard are estimated.Treat field if about 3 or more adults or nymphs/yard are estimated.
	Grasshopper	beta-cyfluthrin*	Baythroid	21	3		Treat field borders if about 8 or more adults or 15 or more nymphs/square yard are estimated.Treat field if about 3 or more adults or nymphs/yard are estimated.
	Grasshopper	bifenthrin*	Capture, generics	30	3		Treat field borders if about 8 or more adults or 15 or more nymphs/square yard are estimated.Treat field if about 3 or more adults or nymphs/yard are estimated.
	Grasshopper	carbaryl	Sevin, Carbaryl, generics	48	1A		Treat field borders if about 8 or more adults or 15 or more nymphs/square yard are estimated.Treat field if about 3 or more adults or nymphs/yard are estimated.
	Grasshopper	cyfluthrin*	Tombstone	21	3		Treat field borders if about 8 or more adults or 15 or more nymphs/square yard are estimated.Treat field if about 3 or more adults or nymphs/yard are estimated.
	Grasshopper	deltamethrin*	Delta Gold, generics	21	3		Treat field borders if about 8 or more adults or 15 or more nymphs/square yard are estimated.Treat field if about 3 or more adults or nymphs/yard are estimated.
	Grasshopper	esfenvalerate*	Asana, generics	21	3		Treat field borders if about 8 or more adults or 15 or more nymphs/square yard are estimated.Treat field if about 3 or more adults or nymphs/yard are estimated.
	Grasshopper	gamma-cyhalothrin*	Declare, Proaxis	21	3		Treat field borders if about 8 or more adults or 15 or more nymphs/square yard are estimated.Treat field if about 3 or more adults or nymphs/yard are estimated.
	Grasshopper	indoxacarb	Steward	1	22A		Treat field borders if about 8 or more adults or 15 or more nymphs/square yard are estimated.Treat field if about 3 or more adults or nymphs/yard are estimated.
	Grasshopper	lambda-cyhalothrin*	Warrior II, generics	21	3		Treat field borders if about 8 or more adults or 15 or more nymphs/square yard are estimated.Treat field if about 3 or more adults or nymphs/yard are estimated.
	Grasshopper	zeta-cypermethrin*	Mustang Max, Respect	7	3		Treat field borders if about 8 or more adults or 15 or more nymphs/square yard are estimated.Treat field if about 3 or more adults or nymphs/yard are estimated.
	Grasshopper	Pre-Mixes
	Grasshopper	lambda-cyhalothrin; chlorantraniliprole*	Besiege	21	3;28		Treat field borders if about 8 or more adults or 15 or more nymphs/square yard are estimated.Treat field if about 3 or more adults or nymphs/yard are estimated.
Japanese Beetle	alpha-cypermethrin*	Fastac	30	3	When tassels are shedding pollen and green silk is continuously clipped back to 1/2 inch or less before 50% pollination has taken place and beetles are present. Beetles usually concentrated along borders.
	Japanese Beetle	beta-cyfluthrin*	Baythroid	21		3	When tassels are shedding pollen and green silk is continuously clipped back to 1/2 inch or less before 50% pollination has taken place and beetles are present. Beetles usually concentrated along borders.
	Japanese Beetle	bifenthrin*	Capture, generics	30		3	When tassels are shedding pollen and green silk is continuously clipped back to 1/2 inch or less before 50% pollination has taken place and beetles are present. Beetles usually concentrated along borders.
	Japanese Beetle	carbaryl	Sevin, Carbaryl, generics	48		1A	When tassels are shedding pollen and green silk is continuously clipped back to 1/2 inch or less before 50% pollination has taken place and beetles are present. Beetles usually concentrated along borders.
	Japanese Beetle	cyfluthrin*	Tombstone	21		3	When tassels are shedding pollen and green silk is continuously clipped back to 1/2 inch or less before 50% pollination has taken place and beetles are present. Beetles usually concentrated along borders.
	Japanese Beetle	deltamethrin*	Delta Gold	21		3	When tassels are shedding pollen and green silk is continuously clipped back to 1/2 inch or less before 50% pollination has taken place and beetles are present. Beetles usually concentrated along borders.
	Japanese Beetle	esfenvalerate*	Asana, generics	21		3	When tassels are shedding pollen and green silk is continuously clipped back to 1/2 inch or less before 50% pollination has taken place and beetles are present. Beetles usually concentrated along borders.
	Japanese Beetle	gamma-cyhalothrin*	Declare, Proaxis	21		3	When tassels are shedding pollen and green silk is continuously clipped back to 1/2 inch or less before 50% pollination has taken place and beetles are present. Beetles usually concentrated along borders.
	Japanese Beetle	lambda-cyhalothrin*	Warrior II, generics	21		3	When tassels are shedding pollen and green silk is continuously clipped back to 1/2 inch or less before 50% pollination has taken place and beetles are present. Beetles usually concentrated along borders.
	Japanese Beetle	zeta-cypermethrin*	Mustang Max, Respect	7		3	When tassels are shedding pollen and green silk is continuously clipped back to 1/2 inch or less before 50% pollination has taken place and beetles are present. Beetles usually concentrated along borders.
	Japanese Beetle	Pre-Mixes
	Japanese Beetle	lambda-cyhalothrin; chlorantraniliprole*	Besiege	21		3;28	When tassels are shedding pollen and green silk is continuously clipped back to 1/2 inch or less before 50% pollination has taken place and beetles are present. Beetles usually concentrated along borders.
Slugs	metaldehyde	Deadline, others	-	-		Spread bait evenly across damaged area if leaves are significantly defoliated and stand is threatened. Use high rate for severe infestations.
Slugs	Slugs	iron phosphate	Ferroxx	-	-		Spread bait evenly across damaged area if leaves are significantly defoliated and stand is threatened. Use high rate for severe infestations.
Spider Mites	dimethoate	Dimethoate, generics	28	1B	If infested fields have significant yield potential (150+ bu/a), spider mite colonies have established on the lower leaves (discolored), and spreading to the ear leaf or above, then treating before the dent stage may be justified.
	Spider Mites	etoxazole	Zeal	21		10B	If infested fields have significant yield potential (150+ bu/a), spider mite colonies have established on the lower leaves (discolored), and spreading to the ear leaf or above, then treating before the dent stage may be justified.
	Spider Mites	hexythiazox	Onager	30		10A	If infested fields have significant yield potential (150+ bu/a), spider mite colonies have established on the lower leaves (discolored), and spreading to the ear leaf or above, then treating before the dent stage may be justified.
	Spider Mites	propargite*	Comite, generics	30		12C	If infested fields have significant yield potential (150+ bu/a), spider mite colonies have established on the lower leaves (discolored), and spreading to the ear leaf or above, then treating before the dent stage may be justified.
	Spider Mites	spiromesifen	Oberon	30		23	If infested fields have significant yield potential (150+ bu/a), spider mite colonies have established on the lower leaves (discolored), and spreading to the ear leaf or above, then treating before the dent stage may be justified.
Stalk Borer	alpha-cypermethrin*	Fastac	30	3	Treatment protects only uninfested plants. When crop stands are threatened, control should be applied to prevent additional plant damage and/or death. Spot spraying infested area(s) of the field is often effective.
	Stalk Borer	beta-cyfluthrin*	Baythroid	21		3	Treatment protects only uninfested plants. When crop stands are threatened, control should be applied to prevent additional plant damage and/or death. Spot spraying infested area(s) of the field is often effective.
	Stalk Borer	bifenthrin*	Capture, generics	30		3	Treatment protects only uninfested plants. When crop stands are threatened, control should be applied to prevent additional plant damage and/or death. Spot spraying infested area(s) of the field is often effective.
	Stalk Borer	cyfluthrin*	Tombstone	21		3	Treatment protects only uninfested plants. When crop stands are threatened, control should be applied to prevent additional plant damage and/or death. Spot spraying infested area(s) of the field is often effective.
	Stalk Borer	deltamethrin*	Delta Gold, generics	21		3	Treatment protects only uninfested plants. When crop stands are threatened, control should be applied to prevent additional plant damage and/or death. Spot spraying infested area(s) of the field is often effective.
	Stalk Borer	esfenvalerate*	Asana, generics	21		3	Treatment protects only uninfested plants. When crop stands are threatened, control should be applied to prevent additional plant damage and/or death. Spot spraying infested area(s) of the field is often effective.
	Stalk Borer	gamma-cyhalothrin*	Declare, Proaxis	21		3	Treatment protects only uninfested plants. When crop stands are threatened, control should be applied to prevent additional plant damage and/or death. Spot spraying infested area(s) of the field is often effective.
	Stalk Borer	lambda-cyhalothrin*	Warrior II, generics	21		3	Treatment protects only uninfested plants. When crop stands are threatened, control should be applied to prevent additional plant damage and/or death. Spot spraying infested area(s) of the field is often effective.
	Stalk Borer	permethrin*	Pounce, generics	30		3A	Treatment protects only uninfested plants. When crop stands are threatened, control should be applied to prevent additional plant damage and/or death. Spot spraying infested area(s) of the field is often effective.
	Stalk Borer	zeta-cypermethrin*	Mustang Max, Respect	7		3	Treatment protects only uninfested plants. When crop stands are threatened, control should be applied to prevent additional plant damage and/or death. Spot spraying infested area(s) of the field is often effective.
	Stalk Borer	Pre-Mixes
	Stalk Borer	lambda-cyhalothrin; chlorantraniliprole*	Besiege	21		3;28	Treatment protects only uninfested plants. When crop stands are threatened, control should be applied to prevent additional plant damage and/or death. Spot spraying infested area(s) of the field is often effective.
Western Bean Cutworm	alpha-cypermethrin*	Fastac	30	3		Treatment may be needed if 5% of the plants have an egg mass and/or young larvae in the whorl.
	Western Bean Cutworm	beta-cyfluthrin*	Baythroid	21	3		Treatment may be needed if 5% of the plants have an egg mass and/or young larvae in the whorl.
	Western Bean Cutworm	bifenthrin*	Capture, generics	30	3		Treatment may be needed if 5% of the plants have an egg mass and/or young larvae in the whorl.
	Western Bean Cutworm	chlorantraniliprole	Coragen	14	28		Treatment may be needed if 5% of the plants have an egg mass and/or young larvae in the whorl.
	Western Bean Cutworm	cyfluthrin*	Tombstone	21	3		Treatment may be needed if 5% of the plants have an egg mass and/or young larvae in the whorl.
	Western Bean Cutworm	esfenvalerate*	Asana, generics	21	3		Treatment may be needed if 5% of the plants have an egg mass and/or young larvae in the whorl.
	Western Bean Cutworm	gamma-cyhalothrin*	Declare, Proaxis	21	3		Treatment may be needed if 5% of the plants have an egg mass and/or young larvae in the whorl.
	Western Bean Cutworm	indoxacarb	Steward	1	22A		Treatment may be needed if 5% of the plants have an egg mass and/or young larvae in the whorl.
	Western Bean Cutworm	lambda-cyhalothrin*	Warrior II, generics	21	3		Treatment may be needed if 5% of the plants have an egg mass and/or young larvae in the whorl.
	Western Bean Cutworm	methoxyfenozide	Intrepid, generics	21	18		Treatment may be needed if 5% of the plants have an egg mass and/or young larvae in the whorl.
	Western Bean Cutworm	permethrin*	Pounce, generics	30	3A		Treatment may be needed if 5% of the plants have an egg mass and/or young larvae in the whorl.
	Western Bean Cutworm	spinetoram	Radiant	28	5		Treatment may be needed if 5% of the plants have an egg mass and/or young larvae in the whorl.
	Western Bean Cutworm	spinsosad	Entrust, generics	28	5		Treatment may be needed if 5% of the plants have an egg mass and/or young larvae in the whorl.
	Western Bean Cutworm	zeta-cypermethrin*	Mustang Max, Respect	7	3		Treatment may be needed if 5% of the plants have an egg mass and/or young larvae in the whorl.
	Western Bean Cutworm	Pre-Mixes
	Western Bean Cutworm	lambda-cyhalothrin; chlorantraniliprole*	Besiege	21	3;28		Treatment may be needed if 5% of the plants have an egg mass and/or young larvae in the whorl.
White Grubs	clothianidin	Poncho, generics	0 day plant-back	4A	No rescue treatments are avaliable. Apply treatments if replanting into damaged field areas and grubs are still present.
	White Grubs	terbufos*	Counter	-		1B	No rescue treatments are avaliable. Apply treatments if replanting into damaged field areas and grubs are still present.
	White Grubs	tefluthrin*	Force	-		3	No rescue treatments are avaliable. Apply treatments if replanting into damaged field areas and grubs are still present.
	White Grubs	thiamethoxam	Cruiser, CruiserMaxx	-		4A	No rescue treatments are avaliable. Apply treatments if replanting into damaged field areas and grubs are still present.
	White Grubs	Pre-Mixes
	White Grubs	bifenthrin; chlorethoxyfos*	SmartChoice	-		3;1B	No rescue treatments are avaliable. Apply treatments if replanting into damaged field areas and grubs are still present.
	White Grubs	cyfluthrin; tebupirimphos*	Aztec, generics	-		3;1A	No rescue treatments are avaliable. Apply treatments if replanting into damaged field areas and grubs are still present.
Wireworms	clothianidin	Poncho, generics	0 day plant-back	4A		No rescue treatments are avaliable. Apply treatments if replanting into damaged field areas and wireworms are still present.
	Wireworms	terbufos*	Counter	-	1B		No rescue treatments are avaliable. Apply treatments if replanting into damaged field areas and wireworms are still present.
	Wireworms	tefluthrin*	Force	-	3		No rescue treatments are avaliable. Apply treatments if replanting into damaged field areas and wireworms are still present.
	Wireworms	thiamethoxam	Cruiser, CruiserMaxx	-	4A		No rescue treatments are avaliable. Apply treatments if replanting into damaged field areas and wireworms are still present.
	Wireworms	Pre-Mixes
	Wireworms	bifenthrin; chlorethoxyfos*	SmartChoice	-	3;1B		No rescue treatments are avaliable. Apply treatments if replanting into damaged field areas and wireworms are still present.
	Wireworms	cyfluthrin; tebupirimphos*	Aztec, generics	-	3;1A		No rescue treatments are avaliable. Apply treatments if replanting into damaged field areas and wireworms are still present.
* Restricted Use Product. ¹Mode of Action: Insecticides are classified based on their target site. Using different, and combined, modes of action may delay insect resistance to insecticide groups. More specific information can be found at IRAC: http://www.irac-online.org.

May 2023

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This work is supported in part by Extension Implementation Grant 2017-70006-27140/ IND011460G4-1013877 from the USDA National Institute of Food and Agriculture.

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