There were seventeen sites reporting this week. European corn borer (ECB)-E was trapped at three sites and ECB-Z was trapped at five sites. The five sites that had ECB-Z were all located in eastern NY. Four sites reported corn earworm (CEW) with the Eden site trap catch high enough to be on a 4 day spray schedule. Fall armyworm (FAW) was trapped at two sites. Several sites have now deployed their Western bean cutworm (WBC) traps, but so far no sites have trapped WBC.
Most sites are well within the growing degree range for peak flight and are approaching the first generation treatment period. This years flight for ECB-E has been very low but continue to scout for any signs of eggs, larvae or feeding damage. The treatment threshold at tassel emergence is 15% infested plants.
Several reports have come in regarding damage attributed to armyworm. The damage is very similar to fall armyworm but the larvae were identified as true armyworm. Larvae can be distinguished by the prominent inverted ‘Y’ on the head of fall armyworm which is not present on true armyworm (see photos below). For more information on true armyworm and the risk to sweet corn please see this recent post by Michigan State University.
-
- True armyworm larva, does not have inverted ‘Y’.
-
- Fall armyworm larva, note the inverted ‘Y’ om head capsule.
-
- True armyworm damage.
-
- FAW feeding damage.
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 | 713.7 | |
| Amsterdam (Fulton Co.) | NA | NA | NA | NA | NA | 726.2 | |
| Athens (Greene Co.) | NA | NA | NA | NA | NA | 769.8 | |
| Avoca (Steuben Co.) | NA | NA | NA | NA | NA | 817.5 | |
| Baldwinsville (Onondaga Co.) | NA | NA | NA | NA | NA | 708.1 | |
| Batavia (Genesee Co.) | 0 | 0 | 1 | 0 | 0 | 654.3 | |
| Bellona (Yates Co.) | NA | NA | NA | NA | NA | 773.8 | |
| Clifton Park (Saratoga Co.) | 0 | 0 | NA | NA | NA | 726.2 | |
| Eden (Erie Co.) | 0 | 0 | 9 | 0 | 0 | 763.1 | |
| Farmersville Sta. (Cattaraugus Co.) | 0 | 0 | 0 | 0 | 0 | 591.3 | |
| Farmington (Ontario Co.) | 0 | 0 | 0 | 0 | 0 | 696.1 | |
| Feura Bush (Albany Co.) | 0 | 1 | 0 | NA | 0 | 660.2 | |
| Florida (Orange Co.) | 0 | 3 | 1 | 3 | 0 | 794.0 | |
| Greenwich (Washington Co.) | 0 | 0 | NA | NA | 0 | 676.5 | |
| Hamlin (Monroe Co.) | NA | NA | NA | NA | NA | 602.9 | |
| Kennedy (Chautauqua Co.) | NA | NA | NA | NA | NA | 607.5 | |
| Kinderhook (Columbia Co.) | NA | NA | NA | NA | NA | 728.1 | |
| King Ferry (Cayuga Co.) | NA | NA | NA | NA | NA | 736.3 | |
| Kirkville (Madison Co.) | NA | NA | NA | NA | NA | 667.0 | |
| LeRoy (Genesee Co.) | NA | NA | NA | NA | NA | 667.7 | |
| Oswego (Oswego Co.) | NA | NA | NA | NA | NA | 641.0 | |
| Owego (Tioga Co.) | NA | NA | NA | NA | NA | 556.5 | |
| Pavilion (Genesee Co.) | NA | NA | NA | NA | NA | 591.3 | |
| Penn Yan (Yates Co.) | 0 | 0 | 0 | 0 | 0 | 724.9 | |
| Peru (Clinton Co.) | 5 | 2 | 0 | 0 | 0 | 569.0 | |
| Plattsburgh (Clinton Co.) | 0 | 0 | 0 | 0 | 0 | 541.5 | |
| Plessis (Jefferson Co.) | NA | NA | NA | NA | NA | 569.0 | |
| Preble (Cortland Co.) | 0 | 0 | 0 | 5 | 0 | 712.8 | |
| Ransomville (Niagara Co.) | 0 | 0 | 0 | 0 | 0 | 691.7 | |
| Salem (Washington Co.) | NA | NA | NA | NA | NA | 676.5 | |
| Schoharie (Schoharie Co.) | 0 | 1 | NA | NA | 0 | . | |
| Seneca Castle (Ontario Co.) | 12 | 0 | 0 | 0 | 0 | 693.8 | |
| Sherwood (Cayuga Co.) | NA | NA | NA | NA | NA | 736.3 | |
| Stone Ridge (Ulster Co.) | 2 | 0 | 1 | 0 | 0 | 713.7 | |
| Tivoli (Dutchess Co.) | 0 | 1 | 0 | 0 | 0 | . | |
| Williamson (Wayne Co.) | NA | NA | NA | NA | NA | 617.2 | |
| 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 6.6.17 – 6.13.17 |
|||||||
