Thirty-three sites reporting this week. European corn borer (ECB)-E was caught at eight sites with a high of 90 at the Seneca Castle site. ECB-Z was caught at seven sites. Thirteen sites reported corn earworm (CEW), with ten sites high enough to be on a 4, 5, or 6 day spray schedule (see table below). Fall armyworm (FAW) was caught at ten sites and Western bean cutworm (WBC) was caught at twenty-eight sites this week.
We saw a real increase in WBC trap catches this week with a high of 148 moth caught at the Plattsburgh site. Below is this week’s estimated WBC flight completion map created by Dan Olmstead, NEWA coordinator, and based on Hanson et al. Check the degree days listed in the table below to see where each site is predicted to be for WBC flight completion.
Western bean cutworm estimated flight completion on 8.5.19.
WBC are most attracted to pretassel corn. Make sure to scout all pretassel fields for egg masses and larvae. After the eggs hatch larvae will first feed in the tassel before making their way to the ears.
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- WBC larvae just after hatching Photo: Tom Cowan
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- Later instar WBC larva, note the two dark bands behind the head capsule. Frank Peairs, Colorado State University
| Location | ECB-E | ECB-Z | CEW | FAW | WBC | DD Base 38F |
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| Accord (Ulster Co.) | 2 | 1 | 0 | 2 | 0 | 3237 | |
| Amsterdam (Fulton Co.) | 18 | 0 | 3 | 0 | 0 | 2813 | |
| Athens (Greene Co.) | NA | NA | NA | NA | NA | 3071 | |
| Attica (Wyoming Co.) | NA | NA | NA | NA | NA | 2746 | |
| Avon (Livingston Co.) | NA | NA | NA | NA | NA | 2760 | |
| Baldwinsville (Onondaga Co.) | 2 | 0 | 1 | 0 | 45 | 2811 | |
| Basom (Genesee Co.) | NA | NA | NA | NA | NA | 2861 | |
| Batavia (Genesee Co.) | 0 | 0 | 0 | 0 | 12 | 2802 | |
| Bellona (Yates Co.) | 0 | 0 | 3 | 0 | 12 | 2855 | |
| Carlton (Orleans Co.) | 0 | 1 | 0 | 0 | 28 | 2694 | |
| Eagle Bridge (Washington Co.) | 0 | 2 | 0 | 0 | 3 | 2776 | |
| Eden (Erie Co.) | 0 | 0 | 2 | 11 | 18 | 2829 | |
| Farmington (Ontario Co) | 0 | 0 | 0 | 0 | 1 | 2862 | |
| Feura Bush (Albany Co.) | 0 | 0 | 0 | 0 | 0 | 3078 | |
| Florida (Orange Co.) | 0 | 3 | 4 | 8 | 2 | 3327 | |
| Geneva (Ontario Co.) | 0 | 0 | 0 | 0 | 0 | 2829 | |
| Greenwich (Washington Co.) | 0 | 0 | 0 | 0 | 6 | 2853 | |
| Hamlin (Monroe Co.) | NA | NA | NA | NA | NA | 2726 | |
| Hurley (Ulster Co.) | 0 | 1 | 0 | 0 | 3 | 3100 | |
| Kennedy (Chautauqua Co.) | 0 | 0 | 3 | 1 | 7 | 2737 | |
| Kinderhook (Columbia Co.) | 0 | 0 | 25 | 10 | 16 | 3083 | |
| King Ferry (Cayuga Co.) | 0 | 0 | 0 | 3 | 8 | 2755 | |
| Kirkville (Madison Co.) | 0 | 10 | 0 | 0 | 3 | 2821 | |
| Lyndonville (Orleans Co.) | 0 | 0 | 0 | 0 | 121 | 2678 | |
| New Paltz (Ulster Co.) | NA | NA | NA | NA | NA | 3299 | |
| Oswego (Oswego Co.) | 0 | 0 | 0 | 0 | 25 | 2472 | |
| Owego (Tioga Co.) | 0 | 0 | 0 | 0 | 3 | 2819 | |
| Penn Yan (Yates Co.) | 1 | 0 | 0 | 1 | 12 | 2785 | |
| Peru (Clinton Co.) | 0 | 0 | 0 | 0 | 2 | 2653 | |
| Plattsburgh (Clinton Co.) | 0 | 0 | 0 | 4 | 148 | 2716 | |
| Plessis (Jefferson Co.) | 0 | 0 | 7 | 1 | 28 | 2613 | |
| Portville (Cattaraugus Co.) | 38 | 0 | 0 | 0 | 4 | 2634 | |
| Preble (Cortland Co.) | 0 | 0 | 0 | 0 | 63 | 2466 | |
| Ransomville (Niagara Co.) | 0 | 0 | 5 | 0 | 8 | 2779 | |
| Schaghticoke (Rensselear Co.) | NA | NA | NA | NA | NA | 3001 | |
| Seneca Castle (Ontario Co.) | 90 | 3 | 0 | 0 | 2 | 2766 | |
| Sharon Springs (Schoharie Co.) | NA | NA | NA | NA | NA | 2736 | |
| Sherwood (Cayuga Co.) | 2 | 0 | 4 | 4 | 9 | 2768 | |
| South Colton (St. Lawrence Co.) | 0 | 0 | 1 | 0 | 37 | 2383 | |
| Stone Ridge (Ulster Co.) | 7 | 0 | 1 | NA | NA | 3071 | |
| Tivoli (Dutchess Co.) | NA | NA | NA | NA | NA | 3232 | |
| Unadilla (Delaware Co.) | 0 | 0 | 3 | 0 | 15 | 2469 | |
| Williamson (Wayne Co.) | NA | NA | NA | NA | NA | 2573 | |
| ECB – European Corn Borer CEW – Corn Earworm FAW – Fall Armyworm WBC – Western Bean Cutworm NA – not available DD – Degree Day (base 38) beginning March 1st Climate Smart Farming |
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| trap catches for the week of 7.30.19 – 8.6.19 |
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Dry Bean Western Bean Cutworm Alert
8.6.19
Marion Zuefle, NYS IPM Program
(Alert modified from Carol McNeil)
(Information and photos from T. Baute, OMAFRA)
This year we are monitoring eight WBC traps placed next to dry bean fields. The location of the traps are given in the image below. Dry bean growers should scout adjacent corn for WBC eggs and larvae when cumulative trap catch reaches 50 moths. This week Avoca H, Avoca W, South Caledonia, Stafford and Wayland reached >50 cumulative moth trap catch. Peak WBC flight historically occurs the first week of August. All dry bean growers should begin scouting pods for WBC feeding about 10 days after peak flight regardless of cumulative trap catch, and should continue to scout for three weeks, especially if damage has been seen in recent years.
Check 10 random spots in a field, 5 plants per spot. Inspect all the pods on the plants looking for holes. Surface feeding can be caused by other insects. WBC will mine directly into the pod and will often feed on the seed inside. European corn borer will also feed inside the pod and would most likely still be present (see image below). Slugs will also feed on the pods causing similar damage, but will often leave a slime trail (image below). If there is damage going directly into the pod and seed but no larva present, it is quite possibly WBC. During the day WBC larva are not actively feeding in the pod, instead they drop to the soil and will remain there until night. Fresh damage will be green, not brown.
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- Early damage made by small WBC larvae.
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- ECB in pod.
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- Damage caused by slug feeding, note slime trail.
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- Later feeding damage going through pod and into beans.
If you have questions contact Marion Zuefle at mez4@cornell.edu or 315-787-2379.
This project is funded by the NYS Dry Bean Industry.
Location of WBC traps near Dry Beans in 2019.
| Dry Bean Location | 7.2.19 | 7.9.19 | 7.16.19 | 7.23.19 | 7.30.19 | 8.6.19 | Cumulative WBC |
| Avoca H (Steuben Co.) | 0 | 0 | 1 | 37* | 37* | 69 | 144 |
| Avoca W (Steuben Co.) | 1 | 1 | 0 | 19* | 19* | 36 | 76 |
| Caledonia South (Livingston Co.) | NA | 0 | 0 | 0 | 44 | 20 | 64 |
| Caledonia Southwest (Livingston Co.) | NA | 0 | 0 | 11 | 8 | 10 | 29 |
| Geneva (Ontario Co.) | NA | NA | 0 | 2 | 10 | 1 | 13 |
| Riga (Monroe Co.) | NA | 0 | 0 | 17 | 61 | 80 | 158 |
| Stafford (Genesee Co.) | NA | 0 | 0 | 5 | 28 | 23 | 56 |
| Wayland (Steuben Co.) | 0 | 2 | 3 | 40.5* | 40.5* | 73 | 159 |
| Western Bean Cutworm trap counts by date NA – not available * traps not checked on 7/23, therefore two week total divided over the two weeks |
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