Pest & Crop

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Purdue Cooperative Extension Service

IN THIS ISSUE

Issue 18, July 31, 2015 • USDA-NIFA Extension IPM Grant
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INSECTS, MITES & NEMATODES




Western Bean Cutworm Flight Declining(Christian Krupke and John Obermeyer) -



  • Moth flight past peak, slowing down.
  • Egg laying and egg hatch should be peaking now.
  • Scout for egg masses and hatched larvae in high-risk fields.

  • The western bean cutworm (WBC) trapping season continues, and from the numbers being reported this past week, we are past the peak moth flight. A large percentage of this year’s eggs have been laid and likely hatched, meaning scouting efforts should switch to the small larvae migrating to areas of protection, such as the whorl, before moving to the ear when they get larger. Use this year’s trap catches (see following trap report) and recent history as your guide for prioritizing scouting areas. As you view the “Western Bean Cutworm Adult Pheromone Trap Report”, notice the variability of moth captures, even from traps within close proximity to each other. Although the relationship between trap catches and damage is not particularly strong (i.e., high trap counts do not always mean high damage), traps are a good timing mechanism and presence/absence indicator. When they spike suddenly, it’s time to scout. Fields near largest trap catches should be prioritized for scouting. But that’s about as far as we can take trap counts in assessing damage potential. Areas/fields with damage last year will likely be at most risk this year.

    Newly hatched western bean cutworm and whorl leaf damage.Newly hatched western bean cutworm and whorl leaf damage.


    Young western bean cutworm larvae in leaf axil.
    Young western bean cutworm larvae in leaf axil.


    Many Bt-traited corn hybrids offer excellent control of WBC and will not require scouting. However, some Bt hybrids do not offer any protection, nor do most varieties of specialty corn, e.g., popcorn, waxy, etc. Scouting is a matter of walking fields and looking for egg masses, generally laid on the top surface of the plant’s uppermost, upright leaves. Concentrate your efforts on pre-tassel/early pollinating corn; this growth stage is preferred by female moths as the young larvae initially feed on pollen. This will be difficult this year because of the field variability due to heavy rains. If more than 5% of plants surveyed have egg masses/live larvae, treatment is advised. If needed, too-early insecticide applications are better than late ones – pyrethroid insecticides will offer enough residual activity in most cases for a few days of killing the tiny hatching larvae as they travel on their way into the plant’s whorl or leaf axils. Happy Scouting!

     

     

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    VIDEO: WBC Scouting Comparison: Spray vs. Non-Spray(Christian Krupke) -



     

     

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    Corn Earworm Trap Report.
    Corn Earworm Trap Report.

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    Western Bean Cutworm Pheromone Trap Report



    County Cooperator WBC Trapped
    Week 1
    6/18/15 - 6/24/15
    Week 2
    6/25/15 - 7/1/15
    Week 3
    7/2/15 - 7/8/15
    Week 4
    7/9/15 - 7/15/15
    Week 5 
    7/16/15 - 7/22/15

    Week 6
    7/23/15-7/29/15

    Adams Kaminsky/New Era Ag 0 0 0 2 3 1
    Adams Roe/Mercer Landmark 0 0 0 0 0 2
    Allen Anderson/Syngenta Seed 0 0 0 5 3 7
    Allen Gynn/Southwind Farms 0 0 1 2 12 7
    Allen Kneubuhler/G&K Concepts 0 0 0 0 5 2
    Bartholomew Bush/Pioneer Hybrids 0 0 0 0 0 0
    Boone Campbell/Beck's Hybrids 0 0 0 0 0 0
    Clay Bower/Ceres Solutions/Brazil 0 0 0 0 0 0
    Clay Bower/Ceres Solutions/Bowling Green 0 0 0 0 0 0
    Clinton Emanuel/Boone Co. CES 0 0 0 1 1 0
    Clinton Foster/Purdue Entomology   0 0 0 5 0
    DeKalb Hoffman/ATA Solutions   0 0 10 114 12
    Dubois Eck/Purdue CES 0 0 0 0 1 0
    Elkhart Kauffman/Crop Tech Inc. 1 1 0 59 89 4
    Fayette Schelle/Falmouth Farm Supply Inc.   0 0 0 0 0
    Fountain Mroczkiewicz/Syngenta 0 0 14 52 2 0
    Fulton Jenkins/N. Central Coop-Rochester 0 2 262 679 701 36
    Fulton Jenkins/N. Central Coop-Kewana 1 2 121 595 362 42
    Gibson Schmitz/Gibson Co. CES 0 0 0 0 0  
    Hamilton Campbell/Beck's Hybrids 0 0 0 0 0 0
    Hamilton Truster/Reynolds Farm Equipment 0 0 0 0 0 1
    Hendricks Nicholson/Nicholson Consulting 0 0 0 0 1 0
    Henry Schelle/Falmouth Farm Supply Inc., Millville   0 0 0 0 0
    Jasper Overstreet/Purdue CES 0 0 2 51 64 12
    Jasper Ritter/Brodbeck Seeds 1 0        
    Jay Boyer/Davis PAC 0 0 0 0 0  
    Jay Shrack/Ran Del Agri Services 0 0 0 0 0 0
    Jay Temple/Jay County CES   2 0      
    Jennings Bauerle/SEPAC 0 1 0 0 0 0
    Knox Bower/Ceres Solutions/Freelandville   0 0 0 0 0
    Knox Bower/Ceres Solutions/Vincennes   0 0 0 0 0
    Knox Bower/Ceres Solutions/Frichton   0 0 0 0 0
    Lake Kleine/Kleine Farms   0 2 14 7 4
    Lake Moyer/Dekalb Hybrids, Shelby 0 2 7 19 165 13
    Lake Moyer/Dekalb Hybrids, Schneider 1 0 4 67 456 76
    LaPorte Rocke/Agri-Mgmt Solutions, Wanatah 0 5 74 141 142 10
    LaPorte Rocke/Agri-Mgmt Solutions, LaCrosse 0 2 135 350 110 5
    Miami Early/Pioneer Hybrids   0 6 141 86 7
    Miami Myers/Myers Ag Service   2 1 9    
    Montgomery Stine/Nicholson Sonsulting 0 0 0 11 3 0
    Newton Moyer/Dekalb Hybrids, Lake Village 0 1 3 13 38 8
    Porter Leuck/PPAC 0 1 10 56 87 4
    Putnam Nicholson/Nicholson Consulting 0 0 0      
    Randolph Boyer/DPAC 0 0 0 2 0  
    Rush Schelle/Falmouth Farm Supply Inc.   0 0 0

    0

     

    0
    Shelby Simpson/Simpson Farms 0 0 2 0 1 0
    Sullivan Bower/Ceres Solutions/Sullivan   0 0 3   2
    Tippecanoe Bower/Ceres Solutions   2 15 30 15 2
    Tippecanoe Nagel/Ceres Solutions 0 0 0 1 0  
    Tippecanoe Obermeyer/Purdue Entomology   0 0 0 1 0
    Tippecanoe Westerfeld/Monsanto 0 0 0 0 0 0
    Whitley Walker/NEPAC 0 0 2 47 119 49

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    WEATHER UPDATE




    Precipitation



    total precipitation

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    Temperature



    average temperature

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    THANKS FOR READING




    Contact Information

    Purdue Extension Entomology
    901 W. State Street
    West Lafayette, IN, 47907
    (765) 494-8761
    luck@purdue.edu
    @PurdueExtEnt
    PurdueEntomology

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