Thirty of 38 sites reported this week. European corn borer (ECB)-E was caught at 3 sites and ECB-Z was caught at 11 sites. Corn earworm was caught at 18 sites with 16 sites high enough to be on a 4, 5, or 6 day spray schedule (see table below). Fall armyworm (FAW) was caught at 16 sites and Western bean cutworm (WBC) was caught at 21 sites.
Both CEW and FAW numbers were up this week (see graph below). Where CEW are being caught in high enough numbers to drive the spray schedule, the other worm pests should also be controlled. At locations with low CEW numbers, scout tassel emergence and silk stage fields for ECB and WBC egg masses and larvae. If WBC are present, use a threshold of 1% infested plants. If they are not being found, use the usual thresholds of 15% infested plants at tassel emergence and 5% in silk stage fields.
Average sweet corn trap catches for all reporting sites from 5.29.18 – 8.21.18.
| Location | ECB-E | ECB-Z | CEW | FAW | WBC | DD to Date |
|
| Accord (Ulster Co.) | 0 | 2 | 5 | NA | 2 | 2250.3 | |
| Amsterdam (Fulton Co.) | NA | NA | NA | NA | NA | 2108.9 | |
| Athens (Greene Co.) | NA | NA | NA | NA | NA | 2332.4 | |
| Avon (Livingston Co.) | 0 | 0 | 6 | 4 | 0 | 2133.6 | |
| Baldwinsville (Onondaga Co.) | 0 | 0 | 24 | 26 | 1 | 2230.3 | |
| Batavia (Genesee Co.) | 0 | 2 | 2 | 0 | 1 | 2203.0 | |
| Bellona (Yates Co.) | 0 | 3 | 12 | 3 | 1 | 2258.8 | |
| Eagle Bridge (Washington Co.) | 0 | 0 | 0 | 0 | 0 | 1999.5 | |
| Eden (Erie Co.) | 0 | 2 | 0 | 2 | 3 | 2175.2 | |
| Farmington (Ontario Co.) | 0 | 0 | 7 | 2 | 0 | 2129.4 | |
| Feura Bush (Albany Co.) | 0 | 1 | 8 | 0 | 10 | 2093.8 | |
| Florida (Orange Co.) | 0 | 0 | 2 | 31 | 5 | 2352.5 | |
| Geneva (Ontario Co.) | 0 | 21 | 33 | 9 | 1 | 2190.6 | |
| Greenwich (Washington Co.) | NA | NA | NA | NA | NA | 1999.5 | |
| Hamlin (Monroe Co.) | NA | NA | NA | NA | NA | 2098.3 | |
| Hurley (Ulster Co.) | 11 | 3 | 9 | 4 | 0 | 2302.7 | |
| Kennedy (Chautauqua Co.) | 0 | 3 | 0 | 1 | 2 | 1955.5 | |
| Kinderhook (Columbia Co.) | 0 | 0 | 5 | 0 | 3 | 2275.5 | |
| King Ferry (Cayuga Co.) | 0 | 0 | 4 | 4 | 2 | 2196.0 | |
| Kirkville (Madison Co.) | NA | NA | NA | NA | NA | 2195.5 | |
| New Paltz (Ulster Co.) | 0 | 0 | 15 | NA | 2 | 2243.9 | |
| Oswego (Oswego Co.) | 0 | 0 | 0 | 28 | 2 | 2141.3 | |
| Owego (Tioga Co.) | 0 | 0 | 0 | 0 | 0 | 1914.5 | |
| Pavilion (Genesee Co.) | 0 | NA | 0 | 80 | 8 | 1838.9 | |
| Penn Yan (Yates Co.) | 0 | 2 | 9 | 10 | 3 | 2238.1 | |
| Peru (Clinton Co.) | 3 | 0 | 0 | 0 | 3 | 2029.1 | |
| Plattsburgh (Clinton Co.) | 2 | 0 | 0 | 0 | 7 | 2024.8 | |
| Plessis (Jefferson Co.) | 0 | 0 | 0 | 0 | 2 | 2076.0 | |
| Preble (Cortland Co.) | NA | NA | NA | NA | NA | 2159.8 | |
| Ransomville (Niagara Co.) | 0 | 0 | 1 | 4 | 5 | 2261.4 | |
| Schaghticoke (Rensselear Co.) | NA | NA | NA | NA | NA | 2278.4 | |
| Seneca Castle (Ontario Co.) | 0 | 0 | 0 | 2 | 0 | 2108.9 | |
| Sharon Springs (Schoharie Co.) | NA | NA | NA | NA | NA | 2163.7 | |
| Sherwood (Cayuga Co.) | 0 | 0 | 29 | 26 | 3 | 2196.0 | |
| South Colton (St. Lawrence Co.) | 0 | 0 | 0 | 0 | 6 | 2006.1 | |
| Stone Ridge (Ulster Co.) | 0 | 1 | 7 | NA | NA | 2302.7 | |
| Tivoli (Dutchess Co.) | 0 | 1 | 1 | NA | NA | 2334.3 | |
| Williamson (Wayne Co.) | 0 | 0 | 0 | 0 | 0 | 2037.8 | |
| ECB – European Corn Borer CEW – Corn Earworm FAW – Fall Armyworm WBC – Western Bean Cutworm NA – not available DD – Degree Day (Modified base 50F) accumulation according to nearest NEWA station |
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| trap catches for the week of 8.14.18 – 8.21.18 |
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Dry Bean Western Bean Cutworm Alert
8.21.18
Marion Zuefle, NYS IPM Program
(Alert modified from Carol McNeil)
(Information and photos from T. Baute, OMAFRA)
This year we are monitoring ten WBC traps placed next to dry bean fields. Peak WBC flight occurred between the last week of July and the first week of August. All dry bean growers should scout their dry beans for any signs of WBC feeding. No damage was seen in the six sites scouted this week (Geneva, Riga, South Caledonia, Chili, Groveland, and Stafford)
Pod feeding typically begins 10 days after peak moth catch. Early feeding by small larvae is generally minor and does not go into the pod. Growers in areas of concern should scout bean pin pods and larger pods for damage/feeding holes. Check 10 spots in a field, 5 plants per spot. WBC larvae hide in the soil during the day and won’t be seen on beans. If you find larvae in the pods during the day they are most likely European corn borer.
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- Early damage made by small WBC larvae.
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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.
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- Later feeding damage on beans.
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- ECB larva in bean pod.
Spraying once, 7-10 days after peak emergence/catch, the ideal timing, resulted in almost no damaged pods in a Michigan trial. Delaying a few days resulted in few damaged beans. A pyrethroid insecticide such as Warrior, Asana, Baythroid, etc. is recommended. Organic growers using Pyganic may need more than one spray, and are advised to spray in the evening.
| Dry Bean Location | 7.10.18 | 7.17.18 | 7.24.18 | 7.31.18 | 8.7.18 | 8.14.18 | 8.21.18 | Cumulative WBC |
| Attica (Wyoming Co.) | 4 | 32 | 105 | 154 | 57 | 26 | 7 | 387 |
| Avoca 1 (Steuben Co.) | 0 | 2 | 37 | 83 | 61 | 10 | 3 | 196 |
| Avoca 2(Steuben Co.) | 2 | 30 | 101 | 150 | 61 | 6 | 1 | 351 |
| Caledonia South (Livingston Co.) | 0 | 6 | 30 | 59 | 35 | 13 | 6 | 149 |
| Chili (Monroe Co.) | 1 | 8 | 54 | 81 | 51 | 12 | 3 | 210 |
| Geneva (Ontario Co.) | 0 | 4 | 24 | 41 | 31 | 2 | 1 | 103 |
| Groveland (Livingston Co.) | 0 | 5 | 76 | 110 | 161 | 59 | 11 | 422 |
| Riga (Monroe Co.) | 5 | 54 | 146 | 71 | 121 | 41 | 22 | 460 |
| Stafford (Genesee Co.) | 0 | 8 | 83 | 80 | 70 | 16 | 6 | 264 |
| Wayland (Steuben Co.) | 2 | 3 | 11 | 9 | 10 | 1 | 0 | 36 |
| Western Bean Cutworm trap counts by date NA – not available |
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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.