Thirty-three sites reporting this week. European corn borer (ECB)-E was trapped at nineteen sites with a high of 76 caught at Hurley in Ulster County. ECB-Z was trapped at seven sites. Corn earworm (CEW) was trapped at sixteen sites, with eleven sites high enough to be on a 4, 5, or 6 day spray schedule (see chart below). Fall armyworm (FAW) was trapped at fifteen sites and Western Bean cutworm (WBC) was trapped at twenty-seven sites this week.
Degree-day accumulations for most sites indicate that between 50% and 75% WBC moths have emerged based on data from University of Nebraska. Peak flight is usually the first week of August, so we might see a drop next week.
Be sure to scout fields that are in whorl or early tassel stage for WBC egg masses, with a 4% threshold for processing sweet corn and a 1% threshold for fresh market sweet corn. It takes between 5-7 days WBC eggs to hatch. It is critical that sprays are timed before the larvae have a chance to enter the ear. The egg mass will become purple in color approximately 24 hours before egg hatch. Here is a video from Purdue on scouting for WBC egg masses and larvae. Corn in the tassel emergence stage should be scouted for ECB and FAW damage and larvae.
Percent WBC moth emergence, data from
University of Nebraska
Average sweet corn trap catches for all reporting sites from 5.23.17 – 8.8.17
| Location | ECB-E | ECB-Z | CEW | FAW | WBC | DD to date |
|
| Accord (Ulster Co.) | 1 | 0 | 1 | 0 | 0 | 1513.2 | |
| Amsterdam (Fulton Co.) | 3 | 0 | 0 | 0 | 0 | 1599.7 | |
| Athens (Greene Co.) | NA | NA | NA | NA | NA | 1675.0 | |
| Avoca (Steuben Co.) | NA | NA | NA | NA | NA | 1359.6 | |
| Baldwinsville (Onondaga Co.) | 3 | 0 | 2 | 1 | 63 | 1521.5 | |
| Batavia (Genesee Co.) | 4 | 0 | 4 | 0 | 40 | . | |
| Bellona (Yates Co.) | 0 | 4 | 0 | 27 | 79 | 1567.3 | |
| Clifton Park (Saratoga Co.) | 0 | 0 | 1 | 7 | 12 | 1599.7 | |
| Eagle Bridge (Washington Co.) | 2 | 2 | 0 | 4 | 24 | 1426.0 | |
| Eden (Erie Co.) | 0 | 2 | 2 | 0 | 153 | 1464.6 | |
| Farmersville Sta. (Cattaraugus Co.) | 0 | 0 | 1 | 9 | 43 | . | |
| Farmington (Ontario Co.) | 3 | 0 | NA | 0 | 10 | 1406.6 | |
| Feura Bush (Albany Co.) | 0 | 0 | 1 | 1 | 17 | 1475.8 | |
| Florida (Orange Co.) | 2 | 2 | 9 | 11 | 6 | 1649.5 | |
| Greenwich (Washington Co.) | 0 | 0 | 0 | 3 | 12 | 1426.0 | |
| Hamlin (Monroe Co.) | 2 | 0 | 3 | 1 | 23 | 1462.9 | |
| Hurley (Ulster Co.) | 76 | 8 | 2 | NA | NA | 1513.2 | |
| Kennedy (Chautauqua Co.) | 1 | 14 | 0 | 0 | 37 | 1265.5 | |
| Kinderhook (Columbia Co.) | 0 | 0 | 3 | 0 | 68 | 1599.0 | |
| King Ferry (Cayuga Co.) | 0 | 0 | 1 | 10 | 33 | 1529.8 | |
| Kirkville (Madison Co.) | 1 | 0 | 2 | 0 | 14 | 1490.8 | |
| LeRoy (Genesee Co.) | 1 | 0 | 4 | 0 | 29 | 1452.6 | |
| Oswego (Oswego Co.) | 3 | 0 | 0 | 0 | 130 | 1428.0 | |
| Owego (Tioga Co.) | 0 | 0 | 0 | 0 | 2 | 1265.5 | |
| Pavilion (Genesee Co.) | 1 | 0 | 0 | 11 | 0 | . | |
| Penn Yan (Yates Co.) | 1 | 0 | 9 | 5 | 9 | 1566.5 | |
| Peru (Clinton Co.) | 0 | 0 | 0 | 0 | 128 | 1348.4 | |
| Plattsburgh (Clinton Co.) | 3 | 0 | 0 | 0 | 81 | 1365.4 | |
| Plessis (Jefferson Co.) | 1 | 0 | 0 | 1 | 153 | 1379.0 | |
| Preble (Cortland Co.) | 0 | 0 | 6 | 13 | 121 | 1452.3 | |
| Ransomville (Niagara Co.) | 0 | 0 | 0 | 0 | 10 | 1543.7 | |
| Schoharie (Schoharie Co.) | 0 | 0 | 0 | 3 | 7 | 1475.8 | |
| Seneca Castle (Ontario Co.) | 5 | 1 | 0 | 0 | 12 | 1475.9 | |
| Sherwood (Cayuga Co.) | NA | NA | NA | NA | NA | 1529.8 | |
| Stone Ridge (Ulster Co.) | NA | NA | NA | NA | NA | 1513.2 | |
| Tivoli (Dutchess Co.) | 1 | 0 | 0 | 0 | 0 | 1577.9 | |
| Williamson (Wayne Co.) | 0 | 0 | 0 | 0 | 0 | 1398.0 | |
| ECB – European Corn Borer CEW – Corn Earworm FAW – Fall Armyworm WBC – Western Bean Cutworm DD – Degree Day (base 50F) accumulation beginning May 1st NA – not available |
|||||||
| trap catches for the week of 8.1.17 – 8.8.17 |
|||||||
