Eighteen sites reported this week. European corn borer (ECB)-E was trapped at six sites and ECB-Z was trapped at eight sites with a high count of 25 ECB-Z at the Penn Yan site. Six sites reported corn earworm (CEW) with four sites high enough to be on a 4 or 5 day spray schedule (see chart at bottom of post). Fall armyworm (FAW) was trapped at two sites. The first trapping of Western Bean cutworm (WBC) occurred this week at the Eden site which caught three moths.
I found egg masses, feeding damage and ECB larvae in a whorl stage field that I scouted this week. For tassel emergence corn the threshold is 15% infested plants. As the tassels begin to emerge larvae will leave the tassel and move down the plant looking for protected places to feed. Insecticide applications need to be timed to kill larvae before they bore into a new feeding location where they will be protected from sprays. For information on how to scout both tassel emerging and silking corn please see the video: How to Scout Fresh Market Sweet Corn Video.
-
- ECB egg mass on underside of leaf.
-
- ECB feeding damage on leaves.
-
- ECB larva inside whorl next to tassel
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 | 853.6 | |
| Amsterdam (Fulton Co.) | NA | NA | NA | NA | NA | 872.7 | |
| Athens (Greene Co.) | NA | NA | NA | NA | NA | 921.7 | |
| Avoca (Steuben Co.) | NA | NA | NA | NA | NA | . | |
| Baldwinsville (Onondaga Co.) | NA | NA | NA | NA | NA | 853.7 | |
| Batavia (Genesee Co.) | 0 | 0 | 0 | 0 | 0 | 810.4 | |
| Bellona (Yates Co.) | NA | NA | NA | NA | NA | 928.5 | |
| Clifton Park (Saratoga Co.) | 0 | 5 | NA | NA | 0 | 872.7 | |
| Eagle Bridge (Washington Co.) | 0 | 0 | 0 | 0 | 0 | 816.0 | |
| Eden (Erie Co.) | 0 | 0 | 15 | 1 | 3 | 929.6 | |
| Farmersville Sta. (Cattaraugus Co.) | 0 | 0 | 0 | 0 | 0 | . | |
| Farmington (Ontario Co.) | 2 | 0 | 1 | 0 | 0 | 840.4 | |
| Feura Bush (Albany Co.) | 1 | 9 | NA | NA | 0 | 806.5 | |
| Florida (Orange Co.) | 3 | 11 | 4 | 2 | 0 | 948.5 | |
| Greenwich (Washington Co.) | 5 | 16 | 8 | 0 | 0 | 816.0 | |
| Hamlin (Monroe Co.) | NA | NA | NA | NA | NA | 751.2 | |
| Hurley (Ulster Co.) | 0 | 1 | 4 | NA | NA | 853.6 | |
| Kennedy (Chautauqua Co.) | NA | NA | NA | NA | NA | 758.0 | |
| Kinderhook (Columbia Co.) | NA | NA | NA | NA | NA | 877.5 | |
| King Ferry (Cayuga Co.) | NA | NA | NA | NA | NA | 886.1 | |
| Kirkville (Madison Co.) | NA | NA | NA | NA | NA | 812.8 | |
| LeRoy (Genesee Co.) | NA | NA | NA | NA | NA | 821.6 | |
| Oswego (Oswego Co.) | 0 | 0 | 0 | 0 | 0 | 780.5 | |
| Owego (Tioga Co.) | 0 | 0 | 0 | 0 | 0 | 714.0 | |
| Pavilion (Genesee Co.) | NA | NA | NA | NA | NA | . | |
| Penn Yan (Yates Co.) | 0 | 25 | 0 | 0 | 0 | 877.4 | |
| Peru (Clinton Co.) | 3 | 0 | 0 | 0 | 0 | 693.3 | |
| Plattsburgh (Clinton Co.) | 0 | 0 | 0 | 0 | 0 | 668.6 | |
| Plessis (Jefferson Co.) | NA | NA | NA | NA | NA | 708.0 | |
| Preble (Cortland Co.) | NA | NA | NA | NA | NA | 855.9 | |
| Ransomville (Niagara Co.) | 0 | 0 | 1 | 0 | 0 | 847.5 | |
| Schoharie (Schoharie Co.) | 0 | 1 | NA | NA | 0 | . | |
| Seneca Castle (Ontario Co.) | 2 | 2 | 0 | 0 | 0 | 839.1 | |
| Sherwood (Cayuga Co.) | NA | NA | NA | NA | NA | 886.1 | |
| Stone Ridge (Ulster Co.) | NA | NA | NA | NA | NA | 853.6 | |
| Tivoli (Dutchess Co.) | NA | NA | NA | NA | NA | 921.6 | |
| Williamson (Wayne Co.) | NA | NA | NA | NA | NA | 758.7 | |
| ECB – European Corn Borer CEW – Corn Earworm FAW – Fall Armyworm WBC – Western Bean Cutworm DD – Degree Day (base 86/50F) accumulation NA – not available |
|||||||
| trap catches for the week of 6.13.17 – 6.20.17 |
|||||||
