NY Sweet Corn Trap Network Report 6.30.20
Twenty-eight sites reported this week with European corn borer (ECB)-E caught at four sites. ECB-Z was caught at two sites. Ten sites reported corn earworm (CEW) with nine high enough to be on a 4, 5 or 6 day spray interval (see table at bottom of post). Fall armyworm (FAW) moths were caught at two sites and the first Western bean cutworm (WBC) was caught at the Williamson site this week. The hybrid ECB moths were caught at two sites, Penn Yan and Hurley.
Based on the accumulated degree days (base 86/50), most sites are still in the first generation treatment period for the bivoltine ECB (see table below) and are just beginning to accumulate enough degree days for the univoltine ECB to emerge.
Degree-day model for univoltine ECB from North Dakota.
European corn borer trap catches remain low this week. Scout tassel emergence stage fields for larvae and feeding damage in the emerging tassel. The treatment threshold at tassel emergence is 15% infested plants which drops to 5% when silking.
Larvae feeding in the whorl are protected from insecticide applications and mortality will not be as high as at tassel emergence, when larvae feeding in the emerging tassel are exposed to the spray. Larvae will leave the tassel as it opens up and no longer provides a moist, protected feeding environment, and move down the plant looking for protected places to feed. Insecticide applications need to be timed to kill larvae before they bore into a new feeding location where again they will be protected from sprays (see photos below to determine correct timing).
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- Tassel too early
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- Well timed
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- Tassel too late
The field I scouted today had very uneven tassel emergence (see photo below). In fields with very uneven development, two applications may be necessary, one when approximately 25-50% of the tassels have emerged, and again after 75-100% of the tassels have emerged, if the field is still over threshold.
Sweet corn field with uneven tassel emergence on 6.30.20. Left two rows have fully emerged tassels and are silking while the rows on the right still have the tassels within the whorl.
| Location | ECB-E | ECB-Z | Hybrid | CEW | FAW | WBC | DD | |
| Western NY trap Catch |
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| Attica (Wyoming Co.) | NA | NA | NA | NA | NA | NA | 841 | |
| Baldwinsville (Onondaga Co.) | 0 | 0 | NA | 2 | 0 | 0 | 900 | |
| Batavia (Genesee Co.) | 1 | 0 | NA | 0 | 0 | 0 | 863 | |
| Bellona (Yates Co.)* | 0 | 0 | 0 | 0 | 1 | 0 | 883 | |
| Brockport (Monroe Co.) | 0 | 0 | NA | 0 | 0 | 0 | 897 | |
| Eden (Erie Co.) | 0 | 0 | NA | 3 | 1 | 0 | 876 | |
| Farmington (Ontario Co)* | 0 | NA | 0 | 0 | 0 | 0 | 910 | |
| Geneva (Ontario Co.)* | 0 | 0 | 0 | 0 | 0 | 0 | 884 | |
| Hamlin (Orleans Co.) | NA | NA | NA | NA | NA | NA | 844 | |
| Kennedy (Chautauqua Co.) | NA | NA | NA | NA | NA | NA | 829 | |
| King Ferry (Cayuga Co.) | NA | NA | NA | NA | NA | NA | 837 | |
| Kirkville (Madison Co.) | NA | NA | NA | NA | NA | NA | 887 | |
| LeRoy (Genesee Co.) | 1 | 0 | NA | 2 | 0 | 0 | 860 | |
| Lyndonville (Orleans Co.) | 0 | 0 | NA | 0 | 0 | 0 | 821 | |
| Oswego (Oswego Co.) | 0 | 0 | NA | 0 | 0 | 0 | 748 | |
| Panama (Chautauqua Co.) | 0 | 0 | NA | 0 | 0 | 0 | 754 | |
| Penn Yan (Yates Co.)* | 0 | 0 | 1 | 0 | 0 | NA | 851 | |
| Portville (Cattaraugus Co.) | 0 | 0 | NA | 1 | 0 | 0 | 770 | |
| Preble (Cortland Co.) | NA | NA | NA | NA | NA | NA | 690 | |
| Ransomville (Niagara Co.) | 0 | 0 | NA | 0 | 0 | 0 | 900 | |
| Seneca Castle (Ontario Co.)* | 0 | 0 | 0 | 0 | 0 | 0 | 854 | |
| Sherwood (Cayuga Co.) | NA | NA | NA | NA | NA | NA | 848 | |
| Williamson (Wayne Co.) | 0 | 0 | NA | 0 | 0 | 1 | 775 | |
| Eastern NY trap Catch |
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| Amsterdam (Fulton Co.) | NA | NA | NA | NA | NA | NA | 864 | |
| Feura Bush (Albany Co.) | 0 | 0 | NA | 2 | 0 | 0 | 957 | |
| Florida (Orange Co.) | 0 | 0 | NA | 5 | NA | NA | 990 | |
| Greenwich (Washington Co.) | 0 | 0 | NA | NA | 0 | 0 | 945 | |
| Hurley (Ulster Co.)* | 1 | 5 | 2 | 2 | 0 | 0 | 947 | |
| Kinderhook (Columbia Co.) | NA | NA | NA | NA | NA | NA | 963 | |
| Melrose (Rensselear Co.) | 0 | 0 | NA | 0 | 0 | 0 | 954 | |
| Middleburgh (Schoharie Co.) | NA | NA | NA | NA | NA | NA | 955 | |
| New Paltz (Ulster Co.) | 0 | 0 | NA | NA | NA | NA | 1027 | |
| Peru (Clinton Co.) | 0 | 0 | NA | 0 | 0 | 0 | 848 | |
| Plattsburgh (Clinton Co.) | 0 | 0 | NA | 0 | 0 | 0 | 875 | |
| Plessis (Jefferson Co.) | NA | NA | NA | NA | NA | NA | 881 | |
| South Colton (St. Lawrence Co.) | NA | NA | NA | NA | NA | NA | 756 | |
| Stone Ridge (Ulster Co.) | 0 | 0 | NA | 9 | NA | NA | 920 | |
| Ticonderoga (Essex Co.) | 0 | 0 | NA | 0 | 0 | 0 | 870 | |
| Tivoli (Dutchess Co.) | 1 | 0 | NA | 2 | NA | NA | 999 | |
| Unadilla (Delaware Co.) | 0 | 4 | NA | 2 | 0 | 0 | 761 | |
| ECB – European Corn Borer CEW – Corn Earworm FAW – Fall Armyworm WBC – Western Bean Cutworm NA – not available DD – Degree Day (base 86/50) accumulation Climate Smart Farming |
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| trap catches for the week of 6.23.20 – 6.30.20 |
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