Eighteen sites reporting this week for Western NY. European corn borer (ECB)-E was caught at three sites and ECB-Z at four sites. Corn earworm (CEW) was not caught at any of the reporting sites while fall armyworm (FAW) was caught at one site, Eden. No reports of Western bean cutworm (WBC) this week.
In addition to our usual Western sites, we now have reports coming in from Eastern NY. Of the thirteen sites located in Eastern NY eight reported this week. Please see the bottom of this post for a table of trap catches from Eastern NY. Trap catch numbers are low in Eastern NY as well. There were three sites that reported CEW with two of the sites high enough to require a 5 or 6 day spray schedule. To view the locations of the Eastern sites please see the map located on the About page.
Even though ECB trap catch numbers remain low, feeding damage has been observed in the field. If corn is in the tassel emergence stage, scouting should focus on the emerging tassel. Separate the leaves and look down into the tassel for any signs of feeding, frass or larvae. The threshold for tassel emergence stage corn is 15%.
If the corn field is silking, scout for egg masses and larvae within the ear zone. The threshold for silking corn drops to 5% infested plants. The ear zone is the area between the two leaves above the top ear and one leaf below the bottom ear. ECB egg masses are usually located on the underside of the leaf along the midrib. The egg mass consists of 10-35 flattened eggs that overlap like fish scales. Eggs take approximately 100 base 50 degree days to hatch. Egg masses will change from white to cream to black as they age. When they appear black they are in the “black head” stage and will most likely hatch with 24 hours. Be sure to check the ear as well, as eggs are sometimes laid on the husk and flag leaves. Larvae are often found between the ear and stalk, or sometimes in the top of the silks.
ECB egg mass – white stage
(photo from UNL Department of Entomology).
ECB egg mass “black head” stage
(photo from UNL Department of Entomology).
| Western NY Locations | ECB-E | ECB-Z | CEW | FAW | WBC | DD to date |
|
| Avoca (Steuben Co.) | 0 | 0 | 0 | 0 | 0 | 996.0 | |
| Avon (Livingston Co.) | 0 | 0 | 0 | 0 | 0 | 1144.6 | |
| Baldwinsville (Onondaga Co.) | 0 | 0 | 0 | 0 | 0 | 1128.6 | |
| Batavia (Genesee Co.) | 0 | 1 | 0 | 0 | 0 | 859.0 | |
| Belfast (Allegany Co.) | 2 | 0 | 0 | 0 | 0 | 987.8 | |
| Bellona (Yates Co.) | NA | NA | NA | NA | NA | 1196.8 | |
| Eden (Erie Co.) | 1 | 0 | 0 | 8 | NA | 1136.1 | |
| Farmington (Ontario Co.) | 0 | 0 | 0 | 0 | 0 | 1073.7 | |
| Hamlin (Monroe Co.) | NA | NA | NA | NA | NA | 1028.1 | |
| Kennedy (Chautauqua Co.) | 0 | 1 | 0 | 0 | 0 | 940.4 | |
| King Ferry (Cayuga Co.) | NA | NA | NA | NA | NA | 1097.2 | |
| Kirkville (Madison Co.) | NA | NA | NA | NA | NA | 1117.5 | |
| LeRoy (Genesee Co.) | NA | NA | NA | NA | NA | 1046.8 | |
| Oswego (Oswego Co.) | 0 | 0 | 0 | 0 | 0 | 1168.3 | |
| Owego (Tioga Co.) | 0 | 0 | 0 | 0 | 0 | 961.6 | |
| Pavilion (Genesee Co.) | 0 | 0 | 0 | 0 | NA | 901.0 | |
| Penn Yan (Yates Co.) | 0 | 0 | 0 | 0 | 0 | 1176.0 | |
| Plessis (Jefferson Co.) | 0 | 0 | 0 | 0 | 0 | 979.9 | |
| Preble (Cortland Co.) | 0 | 0 | 0 | 0 | 0 | 1126.5 | |
| Ransomville (Niagara Co.) | 1 | 1 | 0 | 0 | 0 | 1132.0 | |
| Seneca Castle (Ontario Co.) | 0 | 0 | 0 | 0 | 0 | 1091.6 | |
| Sherwood (Cayuga Co.) | NA | NA | NA | NA | NA | 1097.2 | |
| Spencerport (Monroe Co.) | 0 | 2 | 0 | 0 | 0 | 1144.6 | |
| Waterport (Orleans Co.) | NA | NA | NA | NA | NA | 1034.7 | |
| Williamson (Wayne Co.) | 0 | 0 | 0 | 0 | 0 | 998.5 | |
| ECB – European Corn Borer CEW – Corn Earworm FAW – Fall Armyworm WBC – Western Bean Cutworm DD – Degree Day (modified base 50F) accumulation NA – not available |
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| trap catches for the week of 6.28.16 – 7.5.16 |
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| Eastern NY Locations | ECB-E | ECB-Z | CEW | FAW | WBC | DD to date |
|
| Accord (Ulster Co.) | 1 | 0 | 6 | 0 | 0 | 1119.2 | |
| Amsterdam (Fulton Co.) | NA | NA | NA | NA | NA | 1223.6 | |
| Athens (Greene Co.) | 1 | 0 | 0 | 0 | 0 | 1302.1 | |
| Clifton Park (Saratoga Co.) | NA | NA | NA | NA | NA | 1223.6 | |
| Feura Bush (Albany Co.) | 0 | 0 | 0 | 0 | 0 | 1130.5 | |
| Florida (Orange Co.) | NA | NA | NA | NA | NA | 1337.5 | |
| Greenwich (Washington Co.) | 0 | 0 | 0 | 0 | 0 | 1103.7 | |
| Kinderhook (Columbia Co.) | 0 | 0 | 0 | 0 | 1 | 1215.1 | |
| Peru (Clinton Co.) | NA | NA | NA | NA | NA | 983.5 | |
| Plattsburgh (Clinton Co.) | NA | NA | NA | NA | NA | 975.7 | |
| Salem (Washington Co.) | 0 | 0 | 1 | 0 | 0 | 1103.7 | |
| Schoharie (Schoharie Co.) | 0 | NA | NA | NA | NA | 1133.5 | |
| Stone Ridge (Ulster Co.) | 0 | 0 | 2 | 0 | 0 | 1119.2 | |
| ECB – European Corn Borer CEW – Corn Earworm FAW – Fall Armyworm WBC – Western Bean Cutworm DD – Degree Day (modified base 50F) accumulation NA – not available |
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| trap catches for the week of 6.28.16 – 7.5.16 |
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