Fourteen of 37 sites reported this week. European corn borer (ECB)-E and Z were caught at five sites each. Corn earworm was also caught at five sites, Avon, Eden, Geneva, Hurley and Ransomville. All with counts high enough to be on a 4, 5, or 6 day spray interval (see table below). With cooler weather, <80 degrees, one day can be added to the recommended spray intervals. This is early for CEW in all locations except Eden and these moths most likely came up with the last storm front. No fall armyworm (FAW) or Western bean cutworm (WBC) were caught this week.
Thrips damage was seen in a few fields the last two weeks. They are usually not a problem in sweet corn unless hot, dry, windy weather persists causing the plants to become water stressed. The cooler weather this week knocked back the population in the field I scouted today. Damage appears as white longitudinal spots giving the leaf a gray appearance.
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- Thrip damage on sweet corn
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- Adult thrip on sweet corn
J.W. Apple, Department of Entomology, University of Wisconsin-Madison
| Location | ECB-E | ECB-Z | CEW | FAW | WBC | DD to Date |
|
| Accord (Ulster Co.) | NA | NA | NA | NA | NA | 629.6 | |
| Amsterdam (Fulton Co.) | NA | NA | NA | NA | NA | 536.7 | |
| Athens (Greene Co.) | NA | NA | NA | NA | NA | 598.2 | |
| Avon (Livingston Co.) | 1 | 1 | 5 | 0 | NA | 605.4 | |
| Baldwinsville (Onondaga Co.) | NA | NA | NA | NA | NA | 628.8 | |
| Batavia (Genesee Co.) | NA | NA | NA | NA | NA | 619.0 | |
| Bellona (Yates Co.) | NA | NA | NA | NA | NA | 630.0 | |
| Canton (St. Lawrence Co.) | NA | NA | NA | NA | NA | 503.0 | |
| Eagle Bridge (Washington Co.) | 0 | 0 | NA | 0 | 0 | 508.5 | |
| Eden (Erie Co.) | 0 | 1 | 18 | 0 | 0 | 638.5 | |
| Farmington (Ontario Co.) | 1 | 0 | 0 | 0 | 0 | 608.8 | |
| Feura Bush (Albany Co.) | 0 | 0 | NA | 0 | 0 | 537.3 | |
| Florida (Orange Co.) | NA | NA | NA | NA | NA | 662.0 | |
| Geneva (Ontario Co.) | 1 | 6 | 5 | 0 | NA | 612.3 | |
| Greenwich (Washington Co.) | 0 | 0 | NA | 0 | 0 | 508.5 | |
| Hamlin (Monroe Co.) | NA | NA | NA | NA | NA | 552.5 | |
| Hurley (Ulster Co.) | 6 | 3 | 9 | 0 | NA | 632.5 | |
| Kennedy (Chautauqua Co.) | NA | NA | NA | NA | NA | 571.5 | |
| Kinderhook (Columbia Co.) | 0 | 0 | NA | 0 | 0 | 611.6 | |
| King Ferry (Cayuga Co.) | NA | NA | NA | NA | NA | 615.1 | |
| Kirkville (Madison Co.) | NA | NA | NA | NA | NA | 600.5 | |
| Oswego (Oswego Co.) | NA | NA | NA | NA | NA | 584.9 | |
| Owego (Tioga Co.) | 0 | 0 | 0 | 0 | 0 | 517.5 | |
| Pavilion (Genesee Co.) | NA | NA | NA | NA | NA | 508.3 | |
| Penn Yan (Yates Co.) | 0 | 0 | 0 | 0 | 0 | 640.5 | |
| Peru (Clinton Co.) | NA | NA | NA | NA | NA | 506.2 | |
| Plattsburgh (Clinton Co.) | NA | NA | NA | NA | NA | 471.5 | |
| Plessis (Jefferson Co.) | NA | NA | NA | NA | NA | 529.0 | |
| Preble (Cortland Co.) | NA | NA | NA | NA | NA | 616.6 | |
| Ransomville (Niagara Co.) | 0 | 1 | 2 | 0 | 0 | 608.4 | |
| Schaghticoke (Rensselear Co.) | 0 | 0 | NA | NA | NA | 608.5 | |
| Schoharie (Schoharie Co.) | NA | NA | NA | NA | NA | 536.7 | |
| Seneca Castle (Ontario Co.) | 5 | 0 | 0 | 0 | 0 | 597.6 | |
| Sherwood (Cayuga Co.) | NA | NA | NA | NA | NA | 615.1 | |
| Stone Ridge (Ulster Co.) | NA | NA | NA | NA | NA | 632.5 | |
| Tivoli (Dutchess Co.) | NA | NA | NA | NA | NA | 663.6 | |
| Williamson (Wayne Co.) | 0 | 0 | 0 | 0 | 0 | 518.0 | |
| ECB – European Corn Borer CEW – Corn Earworm FAW – Fall Armyworm WBC – Western Bean Cutworm NA – not available DD – Degree Day (modified base 50F) accumulation |
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| trap catches for the week of 5.29.18 – 6.5.18 |
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