Twenty-one sites reporting this week. Numbers remain low throughout western NY. Only three sites reporting European corn borer (ECB)-E and six sites reporting ECB-Z. Corn earworm (CEW) was caught at four sites this week. All four sites had trap catches low enough to not require a spray. Only Eden reporting Fall armyworm (FAW) this week. Western bean cutworm (WBC) is beginning to appear, with seven sites reporting one moth each.
| Location | ECB-E | ECB-Z | CEW | FAW | WBC | DD to Date |
|
| Avoca (Steuben Co.) | 0 | 0 | 0 | 0 | 0 | 895.5 | |
| Avon (Livingston Co.) | 0 | 0 | 0 | 0 | 1 | 1086.2 | |
| Baldwinsville (Onondaga Co.) | 0 | 0 | 0 | 0 | 1 | 1016.9 | |
| Batavia (Genesee Co.) | 0 | 1 | 0 | 0 | 1 | 772.3 | |
| Belfast (Allegany Co.) | 0 | 3 | 0 | 0 | 0 | 929.5 | |
| Bellona (Yates Co.) | NA | NA | NA | NA | NA | 1115.1 | |
| Eden (Erie Co.) | 0 | 0 | 1 | 1 | 1 | 951.4 | |
| Farmington (Ontario Co.) | 0 | 0 | 0 | 0 | 0 | 973.5 | |
| Hamlin (Monroe Co.) | 1 | 2 | 0 | 0 | 0 | 950.3 | |
| Kennedy (Chautauqua Co.) | 0 | 1 | 0 | 0 | 1 | 842.0 | |
| King Ferry (Cayuga Co.) | 0 | 0 | 1 | 0 | 0 | 1049.5 | |
| Kirkville (Madison Co.) | NA | NA | NA | NA | NA | 1082.5 | |
| LeRoy (Genesee Co.) | 0 | 1 | 1 | 0 | 0 | 924.3 | |
| Lockport (Niagara Co.) | 0 | 0 | 0 | 0 | 1 | 949.5 | |
| Oswego (Oswego Co.) | 1 | 0 | 0 | 0 | 0 | 948.1 | |
| Owego (Tioga Co.) | NA | NA | NA | NA | NA | 923.9 | |
| Pavilion (Genesee Co.) | 0 | 0 | 0 | 0 | 0 | 924.3 | |
| Penn Yan (Yates Co.) | 0 | 0 | 0 | 0 | 0 | 1069.4 | |
| Plessis (Jefferson Co.) | 0 | 0 | 0 | 0 | 0 | 915.0 | |
| Preble (Cortland Co.) | 0 | 0 | 0 | 0 | 1 | 1010.5 | |
| Seneca Castle (Ontario Co.) | 0 | 0 | 0 | 0 | 0 | 991.9 | |
| Sherwood (Cayuga Co.) | NA | NA | NA | NA | NA | 1049.5 | |
| Spencerport (Monroe Co.) | 0 | 2 | 1 | 0 | 0 | 1086.2 | |
| Waterport (Orleans Co.) | 0 | 0 | 0 | 0 | 0 | 950.3 | |
| Williamson (Wayne Co.) | 2 | 0 | 0 | 0 | 0 | 897.8 | |
| ECB – European Corn Borer CEW – Corn Earworm FAW – Fall Armyworm WBC – Western Bean Cutworm NA – not available DD – Degree Day (modified base 50F) accumulation |
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| trap catches for the week of 6.30.15 – 7.7.15 | |||||||
Michigan State University recommends scouting for WBC egg masses when cumulative trap catch numbers reach 100 moth/trap for field corn, however egg masses have been found in sweet corn when trap catches were still in the single digits. Therefore it is recommended that all fields that are in the whorl or early tassel stage be scouted for egg masses with a 4% threshold for processing sweet corn and a 1% threshold for fresh market sweet corn. WBC will usually lay eggs on the upper side of the top 1-3 leaves of pre-tassel corn, close to the leaf base. After tasseling has finished WBC seek out younger corn or dry beans. To scout for egg masses check the top 3 leaves of ten corn plants in ten locations throughout the field. The eggs are easy to observe if you view the leaf while holding it towards the sun. The egg mass will appear as a distinct shadow (see photo).
It takes between 5-7 days for 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 (see photo). See the western bean cutworm fact sheetand ID card for additional photos of egg masses and larvae.
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- WBC egg mass shadow. Photo: T. Baute
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- WBC egg mass.
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- WBC eggs become purple prior to hatch. Photo: Marlin Rice
