European corn borer (ECB) trap catches are in the single digits at all locations this week. Corn earworm (CEW) were caught at 9 locations this week with some locations needing a 5 or 6 day spray schedule (see chart below). Three sites reported fall armyworm (FAW), one site as high as 10 moths.
Western bean cutworm (WBC) was caught at 13 sites this week. The high count was once again in Plessis with 46 moths. The counts for the week are lower than last week, possibly because moth flight has peaked. The degree day accumulation (May 1st, base 50°F) for sweet corn trap network sites ranges from 1418-1804 with an average of 1608. Most areas are above 75% WBC moth emergence which occurs at 1536 base 50 degree days (for local population). I have included a column of cumulative WBC counts to date for each site. Michigan State University recommends scouting for WBC egg masses when cumulative trap catch numbers reach 100 moth/trap for field corn. Whether this guideline also pertains to sweet corn is not known. Therefore it is recommended that all fields that are in the whorl or early tassel stage should be scouted for egg masses (see previous post on how to scout) with a 4% threshold for processing sweet corn and a 1% threshold for fresh market sweet corn. WBC egg masses have been reported in two counties, Lewis and Genesee, with one of these sites still well below the recommended MSU guidelines for scouting in field corn. This location has a cumulative trap count of 43 WBC moths.
| Location | ECB-E | ECB-Z | CEW | FAW | WBC | Total WBC to date |
| Avoca (Steuben Co.) | 0 | 1 | 2 | 0 | 0 | 6 |
| Avon (Livingston Co.) | 0 | 0 | 1 | 0 | 4 | 36 |
| Baldwinsville (Onondaga Co.) | 1 | 1 | 1 | 0 | 3 | 33 |
| Batavia (Genesee Co.) | 5 | 3 | 1 | 0 | 5 | 27 |
| Bellona (Yates Co.) | NA | NA | NA | NA | NA | 104 |
| Eden (Erie Co.) | 0 | 0 | 0 | 0 | 0 | 15 |
| Farmington (Ontario Co.) | 5 | 1 | 0 | 0 | 0 | 5 |
| Hamlin (Monroe Co.) | 0 | 2 | 3 | 0 | 6 | 22 |
| Interlaken (Seneca Co.) | 1 | NA | NA | 5 | 7 | 45 |
| Kennedy (Chautauqua Co.) | 0 | 0 | 1 | 0 | 1 | 18 |
| King Ferry (Cayuga Co.) | NA | NA | NA | NA | NA | 6 |
| Kirkville (Madison Co.) | 8 | 1 | 0 | 0 | 5 | 12 |
| LeRoy (Genesee Co.) | 0 | 3 | 4 | 0 | 24 | 43 |
| Lockport (Niagra Co.) | 0 | 0 | 0 | 0 | 0 | 3 |
| Oswego (Oswego Co.) | NA | NA | NA | NA | NA | 54 |
| Owego (Tioga Co.) | NA | NA | NA | NA | NA | 4 |
| Penn Yan (Yates Co.) | 0 | 0 | 3 | 3 | 6 | 43 |
| Pike (Wyoming Co.) | NA | NA | NA | NA | NA | NA |
| Plessis (Jefferson Co.) | 0 | 0 | 0 | 0 | 46 | 151 |
| Preble (Cortland Co.) | 0 | 0 | 0 | 10 | 2 | 1 |
| Sherwood (Cayuga Co.) | NA | NA | NA | NA | NA | NA |
| Spencerport (Monroe Co.) | 0 | 0 | 0 | 0 | 0 | 10 |
| Waterport (Orleans Co.) | 0 | 0 | 0 | 0 | 3 | 23 |
| Williamson (Wayne Co.) | 0 | 3 | 1 | 0 | 13 | 63 |
| 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 8.6.13 – 8.13.13 |
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