Fifteen sites reporting this week. European corn borer (ECB) numbers remain low for the season. ECB-E was caught at only two sites, Baldwinsville and Seneca Castle and ECB-Z was caught at Spencerport all in the low single digits. One corn earworm (CEW) was caught at Spencerport which is low enough to not require a spray (see table at bottom of post). Fall armyworm (FAW) was caught at four sites, Avon, Baldwinsville, Eden, and Randsomville. No reports yet of Western bean cutworm (WBC).
Fall armyworm (FAW) were caught each week since the first blog posting of the season. This week, while scouting a field, I observed FAW feeding damage and frass. The larva was found feeding in the whorl (see pictures below). To identify FAW larva look for the inverted ‘Y’ on the head.
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- Fall armyworm
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- Fall armyworm feeding damage and frass.
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- Fall armyworm larva, note the inverted ‘Y’ om head capsule.
Degree day accumulations, based on the nearest NEWA weather station, are given for each trapping site. Most sites are now above the degree days needed for first ECB eggs. ECB eggs require 100 degree days (base 50) from oviposition to hatch. Scout tassel emergence stage fields for larvae and feeding damage in the emerging tassel. The treatment threshold at tassel emergence is 15% infested plants.
J.W. Apple, Department of Entomology, University of Wisconsin-Madison
| Location | ECB-E | ECB-Z | CEW | FAW | WBC | DD to date |
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| Avoca (Steuben Co.) | NA | NA | NA | NA | NA | 431.5 | |
| Avon (Livingston Co.) | 0 | 0 | 0 | 3 | 0 | 541.0 | |
| Baldwinsville (Onondaga Co.) | 1 | 0 | 0 | 2 | 0 | 520.2 | |
| Batavia (Genesee Co.) | 0 | 0 | 0 | 0 | 0 | 342.8 | |
| Belfast (Allegany Co.) | NA | NA | NA | NA | NA | 469.7 | |
| Bellona (Yates Co.) | NA | NA | NA | NA | NA | 575.1 | |
| Eden (Erie Co.) | 0 | 0 | 0 | 9 | 0 | 508.2 | |
| Farmington (Ontario Co.) | 0 | 0 | 0 | 0 | 0 | 476.6 | |
| Hamlin (Monroe Co.) | 0 | 0 | 0 | 0 | 0 | 454.0 | |
| Kennedy (Chautauqua Co.) | 0 | 0 | 0 | 0 | 0 | 456.0 | |
| King Ferry (Cayuga Co.) | NA | NA | NA | NA | NA | 491.0 | |
| Kirkville (Madison Co.) | 0 | 0 | 0 | 0 | 0 | 530.9 | |
| LeRoy (Genesee Co.) | 0 | 0 | 0 | 0 | 0 | 540.1 | |
| Ransomville (Niagara Co.) | 0 | 0 | 0 | 1 | 0 | 481.6 | |
| Oswego (Oswego Co.) | NA | NA | NA | NA | NA | 567.3 | |
| Owego (Tioga Co.) | 0 | 0 | 0 | 0 | 0 | 444.0 | |
| Pavilion (Genesee Co.) | NA | NA | NA | NA | NA | 450.1 | |
| Penn Yan (Yates Co.) | NA | 0 | 0 | 0 | 0 | 533.0 | |
| Plessis (Jefferson Co.) | NA | NA | NA | NA | NA | 461.9 | |
| Preble (Cortland Co.) | NA | NA | NA | NA | NA | 502.5 | |
| Seneca Castle (Ontario Co.) | 1 | NA | 0 | 0 | 0 | 505.6 | |
| Sherwood (Cayuga Co.) | NA | NA | NA | NA | NA | 491.0 | |
| Spencerport (Monroe Co.) | 0 | 4 | 1 | 0 | 0 | 541.0 | |
| Waterport (Orleans Co.) | NA | NA | NA | NA | NA | 454.0 | |
| Williamson (Wayne Co.) | 0 | 0 | 0 | 0 | 0 | 440.0 | |
| ECB – European Corn Borer CEW – Corn Earworm FAW – Fall Armyworm WBC – Western Bean Cutworm DD – Degree Day (base 50F) accumulation NA – not available |
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| trap catches for the week of 6.7.16 – 6.14.16 |
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