Pest & Crop

Newsletter


Purdue Cooperative Extension Service

IN THIS ISSUE

Issue 4, April 21, 2017 • USDA-NIFA Extension IPM Grant




Insects, Mites, and Nematodes

Weather Update



INSECTS, MITES, & NEMATODES




This Week, Even More Armyworm Moths (Christian Krupke) -



This spring continues to shape up as a year with heavy armyworm pressure. With relatively little corn planted so far this isn’t time to panic – but we typically don’t see levels this high at this time of year, so if you have never scouted for armyworms before, this would be a good year to start! You’ll probably find some.  

The northeastern part of the state, where we happen to also grow wheat (armyworms love wheat) in some areas, is particularly thick with migrant moths. The female moths that arrive will be loaded with eggs and looking for suitable hosts to lay them on – many plants will do the job, with grasses strongly preferred. If you have wheat acreage, or your soon-to-be-corn acres have a grass cover crop, particularly cereal rye, those fields will be an armyworm magnet. Depending on when that cover crop is killed and corn is planted, the crop could be at risk.

The level of risk depends on two main factors: 1) the level of armyworm pressure in the area (see Table below - this will be high in much of the state this year), and 2) the degree of overlap between the grass host and emerging corn. That might also be high this year. As stated last week, a period without green, growing material will readily starve most armyworms. When that’s not possible, it’s time to reach for the insecticides to hit the larvae before they can feed on emerging corn. There are many insecticide options Corn Insect Control Recommendations - E-219, but all will work best when larvae are small (less than 1¼”in length).

Scouting fields beginning late next week is advised… before then, the larvae will be too small to see easily. By early May, larvae should be quite conspicuous and scouting will be relatively easy. A sweep net can be used, or even just visually inspecting plants for damage and/or feeding larvae will work. Disturbing and poking through the top layer of soil will reveal the larvae during sunny days, when they often rest here. Although there is not a threshold for armyworm in cover crops, 4 larvae/sq. ft is the guideline in wheat. Remember, Bt corn and seed treatments won’t save you from this one. So venture out late next week and check those high-risk fields.

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Alfalfa Weevil Development Map



total precipitation

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Armyworm Pheromone Trap Report



County/Cooperator Wk 1 Wk 2 Wk 3 Wk 4 Wk 5 Wk 6 Wk 7 Wk 8 Wk 9 Wk 10 Wk 11 Wk 12
Dubois/SIPAC Ag Center 0 0 0 101 193              
Jennings/SEPAC Ag Center 0 1 1 56 57              
Knox/SWPAC Ag Center 0 13 26 42 189              
LaPorte/Pinney Ag Center 0 0 3 352 936              
Lawrence/Feldun Ag Center 4 108 216 246 650              
Randolph/Davis Ag Center 0 29 41 528 1232              
Tippecanoe/Meigs 0 2 15 107 730              
Whitley/NEPAC Ag Center 0 34 90 537 1689              

Wk 1 = 3/16/17 - 3/22/17; Wk 2 = 3/23/17 - 3/29/17; Wk 3 - 3/30/17 - 4/5/17; Wk 4 - 4/7/18 - 4/12/17; Wk 5 - 4/13/17 - 4/19/17

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Black Cutworm Adult Pheromone Trap Report



County Cooperator BCW Trapped

Week 1
3/23/17-3/29/17

Week 2
3/30/17-4/5/17
Week 3 4/5/17-4/12/17 Week 5 - 4/13/17 - 4/19/17  
Adams Kaminsky/New Era Ag     13 35  
Adams Roe/Mercer Landmark 11 17* 7 42  
Allen Anderson/Syngenta Seed   0      
Allen Gynn/Southwind Farms 2 1 0 15  
Allen Kneubuhler/G&K Concepts - Trap 1   0 19* 36  
Allen Kneubuhler/G&K Concepts - Trap 2   9 2    
Bartholomew Bush/Pioneer Hybrids 1 13* 13 17  
Clay Bower/Ceres Solutions - Clay City 0 0 7 4  
Clay Bower/Ceres Solutions - Bowling Green 0 0 0    
Clay Bower/Ceres Solutions - Brazil 0 0 0    
Clinton Emanuel/Boone Co. CES 8 9 6 10  
DeKalb Hoffman/ATA Solutions 0 0 0 1  
Dubois Eck/Purdue CES 14 28* 41* 4  
Elkhart Kauffman/Crop Tech Inc. 0 0 6 16  
Fayette Schelle/Falmouth Farm Supply Inc. 5 33* 5    
Fountain Mroczkiewicz/Syngenta 7 18* 31* 93*  
Fulton Jenkins/N. Central Coop - Talma 0 5 10 13  
Fulton Ranstead/NCC Coop - Rochester 0 0 0 3  
Gibson Schmitz/Gibson Co. CES       0  
Hamilton Campbell/Beck's Hybrids 14 13 18 55*  
Hamilton Truster/Reynolds Farm Equipment   1   1  
Hendricks Nicholson/Nicholson Consulting 0 3 4 11  
Jasper Overstreet/Jasper Purdue CES 2 5 0 5  
Jasper Ritter/Brodbeck Seeds 1 3 10 32  
Jay Boyer/Davis PAC   3 14 19  
Jay Shrack/Ran-Del Agri Services 1 3 5 9  
Jay Temple/Jay County CES          
Jennings Bauerle/SEPAC 0 0 0 0  
Knox Bower/Ceres Solutions - Freelandville 0 0 0 13*  
Knox Bower/Ceres Solutions - Vincennes 0 0 0    
Kosciusko Klotz/Etna Green 0 0 4 9  
Lake Kleine/Kleine Farms 4 16* 60* 83*  
Lake Moyer/Dekalb Hybrids - Shelby 5 5 20* 27  
Lake Moyer/Dekalb Hybrids - Schneider 2 5 5 12  
LaPorte Rocke/Agri-Mgmt Solutions     4 41  
Madison Truster/Reynolds Farm Equipment   0      
Marshall Harrell/Harrell Ag Services   0      
Marshall Klotz/SR 10 & SR 331 0 0 0 8  
Marshall Miller/North Central Coop 0 0 0 2  
Miami Early/Pioneer Hybrids 0 0 0    
Newton Moyer/Dekalb Hybrids - Lake Village 2 6 2 8  
Porter Leuck/PPAC 5 3 18 25  
Pulaski Capouch/M&R Ag Services 0 0 1 10  
Pulaski Leman/North Central Coop   0 10 21  
Putnam Nicholson/Nicholson Consulting   2 6 2  
Randolph Boyer/DPAC   1 0 1  
Rush Schelle/Falmouth Farm Supply Inc.   6 10 1  
Shelby Fisher/Shelby County Co-op 2 3 5 5  
Shelby Simpson/Simpson Farms 7 49* 41* 67*  
Starke Capouch/M&R Ag Services 0 0 6 28  
Starke Wickert/Wickert Consulting - California Twnshp 1 1 3 4  
Starke Wickert/Wickert Consulting - Railroad Twnshp 0 0 0 0  
St. Joseph Barry/Helena     1 3  
Sullivan Bower/Ceres Solutions - Farmersburg 0 1 2 14  
Sullivan Bower/Ceres Solutions - Sullivan 6 21* 14* 16*  
Tippecanoe Bower/Ceres Solutions 0 0 0 7  
Tippecanoe Kremer/Monsanto Research Farm 0 0 13 11  
Tippecanoe Nagel/Ceres Solutions 30 47* 44* 89  
Tippecanoe Obermeyer/Purdue Entomology 2 5 11 5  
Tipton Campbell/Beck's Hybrids 10 17 11 73*  
Vermillion Bower/Ceres Solutions   0 0    
Wabash Enyeart/North Central Coop       0  
Whitley Walker, Richards/NEPAC1 - Main 10 28* 37* 81*  
Whitley Walker, Richards/NEPAC2 - Kyler 3 8 17* 36*  

* = Intensive Capture...this occurs when 9 or more moths are caught over a 2-night period


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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

1-888-EXT-INFO

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