Trap catches for all moths were up this week. Seven sites reported European corn borer (ECB)-E and six had ECB-Z. Corn earworm (CEW) was found at six sites, with numbers at three sites in the range indicating a need for a six-day spray interval, please see the chart at the bottom of this page. Only two sites reported fall armyworm (FAW) but eight sites reported western bean cutworm (WBC). The WBC flight is just starting, and numbers are too low to indicate a need for scouting at this time. We’ll provide more information next week.
Today we scouted a field in Tioga county at tassel emergence and observed both ECB and FAW damage. The field scouted over threshold even though the trap catch numbers at this site have been low. The scouted field however was in a different location from the traps. Each field is different and even if trap numbers are low and one field scouts below threshold, it is still important to scout fields that are in different locations. The ECB population can be very different between fields. Remember that the threshold for silking corn is 5% infested and 15% for tassel emerging corn.
I also received one report of corn leaf aphids being found. The threshold for corn leaf aphid at tassel emergence is 50% of plants with more than 20 aphids.
Corn leaf aphids on tassel.
Very heavy corn leaf aphid infestation on tassel.
| Location | ECB-E | ECB-Z | CEW | FAW | WBC |
| Avoca (Steuben Co.) | 0 | 0 | 0 | 0 | 0 |
| Avon (Livingston Co.) | NA | NA | NA | NA | NA |
| Baldwinsville (Onondaga Co.) | 0 | 0 | 0 | 0 | 0 |
| Batavia (Genesee Co.) | 5 | 0 | 1 | 0 | 3 |
| Bellona (Yates Co.) | 0 | 0 | 0 | 0 | 0 |
| Eden (Erie Co.) | 0 | 0 | 3 | 0 | 2 |
| Farmington (Ontario Co.) | 3 | 1 | 0 | 0 | 0 |
| Hamlin (Monroe Co.) | 0 | 3 | 2 | 0 | 0 |
| Interlaken (Seneca Co.) | 0 | 0 | 0 | 0 | 0 |
| Kennedy (Chautauqua Co.) | 1 | 2 | 0 | 0 | 1 |
| King Ferry (Cayuga Co.) | 4 | 0 | 0 | 1 | 0 |
| Kirkville (Madison Co.) | 0 | 0 | 0 | 0 | 0 |
| LeRoy (Genesee Co.) | 2 | 5 | 0 | 0 | 0 |
| Lockport (Niagra Co.) | 0 | 0 | 0 | 0 | 0 |
| Oswego (Oswego Co.) | 7 | 2 | 0 | 2 | 1 |
| Owego (Tioga Co.) | 0 | 0 | 0 | 0 | 1 |
| Penn Yan (Yates Co.) | 0 | 0 | 0 | 0 | 1 |
| Pike (Wyoming Co.) | NA | NA | NA | NA | NA |
| Plessis (Jefferson Co.) | 0 | 1 | 1 | 0 | 1 |
| Preble (Cortland Co.) | 0 | 0 | 1 | 0 | 0 |
| Sherwood (Cayuga Co.) | NA | NA | NA | NA | NA |
| Spencerport (Monroe Co.) | 0 | 0 | 2 | 0 | 2 |
| Waterport (Orleans Co.) | 0 | 0 | 0 | 0 | 0 |
| Williamson (Wayne Co.) | 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 7.9.13 – 7.16.13 |
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