Twenty-two sites reporting this week. Ten sites reporting European corn borer (ECB)-E and ten sites reporting ECB-Z. Corn earworm (CEW) was caught at ten sites with seven sites high enough to require either a 6, 5, or 4 day spray schedule (see table below). Thirteen sites reporting Fall armyworm (FAW), which has shown a slight increase over the last week. Western bean cutworm (WBC) was still caught at eighteen sites but the average catch was down significantly from the previous week (see chart below).
Fields that are in whorl or early tassel stage should be scouted 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.
Average sweet corn trap catches for all reporting sites from 5.25.15 – 8.18.15
| Location | ECB-E | ECB-Z | CEW | FAW | WBC | Total WBC to date |
|
| Avoca (Steuben Co.) | 0 | 1 | 2 | 0 | 0 | 17 | |
| Avon (Livingston Co.) | NA | NA | NA | NA | NA | 25 | |
| Baldwinsville (Onondaga Co.) | 0 | 0 | 0 | 7 | 23 | 136 | |
| Batavia (Genesee Co.) | 5 | 0 | 9 | 0 | 3 | 22 | |
| Belfast (Allegany Co.) | 4 | 0 | 0 | 1 | 0 | 4 | |
| Bellona (Yates Co.) | 14 | 5 | 0 | 40 | 53 | 194 | |
| Eden (Erie Co.) | 0 | 3 | 0 | 10 | 65 | 941 | |
| Farmington (Ontario Co.) | 1 | 3 | 0 | 0 | 1 | 20 | |
| Hamlin (Monroe Co.) | 5 | 0 | 1 | 4 | 45 | 88 | |
| Kennedy (Chautauqua Co.) | 0 | 2 | 0 | 2 | 47 | 120 | |
| King Ferry (Cayuga Co.) | 1 | 0 | 0 | 6 | 3 | 26 | |
| Kirkville (Madison Co.) | 3 | 0 | 0 | 0 | 3 | 19 | |
| LeRoy (Genesee Co.) | 0 | 3 | 3 | 0 | 37 | 74 | |
| Lockport (Niagra Co.) | 0 | 6 | 4 | 0 | 4 | 29 | |
| Oswego (Oswego Co.) | 0 | 0 | 0 | 2 | 7 | 84 | |
| Owego (Tioga Co.) | NA | NA | NA | NA | NA | 7 | |
| Pavilion (Genesee Co.) | 0 | 1 | 1 | 65 | 47 | 513 | |
| Penn Yan (Yates Co.) | 2 | 9 | 2 | 12 | 1 | 65 | |
| Plessis (Jefferson Co.) | 0 | 0 | 0 | 1 | 13 | 228 | |
| Preble (Cortland Co.) | 0 | 0 | 0 | 1 | 7 | 35 | |
| Seneca Castle (Ontario Co.) | 4 | 0 | 2 | 0 | 2 | 18 | |
| Sherwood (Cayuga Co.) | NA | NA | NA | NA | NA | NA | |
| Spencerport (Monroe Co.) | 2 | 7 | 6 | 1 | 4 | 8 | |
| Waterport (Orleans Co.) | 0 | 0 | 1 | 0 | 0 | 7 | |
| Williamson (Wayne Co.) | 0 | 0 | 0 | 0 | 0 | 0 | |
| ECB – European Corn Borer CEW – Corn Earworm FAW – Fall Armyworm WBC – Western Bean Cutworm NA – not available |
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| trap catches for the week of 8.11.15 – 8.18.15 |
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