August 20, 2019

NY Sweet Corn Trap Network Report 8.20.19

Twenty-seven sites reporting this week. European corn borer (ECB)-E was caught at five sites with a high of 19 at the Seneca Castle site again. ECB-Z was caught at four sites. Seventeen sites reported corn earworm (CEW), with twelve high enough to be on a 4, 5, or 6 day spray schedule (see table at bottom of post). Fall armyworm (FAW) was caught at ten sites and Western bean cutworm (WBC) was caught at twenty-one sites this week. WBC peaked last week, about two weeks later than previous years and CEW is beginning to increase again (see graph below).

Average sweet corn trap catches from 5.28.19 – 8.20.19.

Average sweet corn trap catches for all reporting sites from 5.28.19 – 8.20.19.

Use the table below to determine the estimated WBC flight completion for your site using the Base 38F column. This model is still being validated for NY.

WBC flight emergence table

NEWA Western bean cutworm flight emergence lookup table.

 

Location ECB-E ECB-Z CEW FAW WBC DD Base 38F
Accord (Ulster Co.) NA NA NA NA NA 3711
Amsterdam (Fulton Co.) NA NA NA NA NA 3245
Athens (Greene Co.) NA NA NA NA NA 3535
Attica (Wyoming Co.) 0 0 1 0 1 3168
Avon (Livingston Co.) NA NA NA NA NA 3196
Baldwinsville (Onondaga Co.) 2 0 4 2 81 3253
Basom (Genesee Co.) NA NA NA NA NA 3308
Batavia (Genesee Co.) NA NA NA NA NA 3231
Bellona (Yates Co.) 0 0 13 2 7 3301
Carlton (Orleans Co.) 0 0 0 0 30 3140
Eagle Bridge (Washington Co.) NA NA NA NA NA 3207
Eden (Erie Co.) 0 0 6 12 16 3278
Farmington (Ontario Co) 0 0 0 0 3 3322
Feura Bush (Albany Co.) NA NA NA NA NA 3538
Florida (Orange Co.) NA NA NA NA NA 3807
Geneva (Ontario Co.) 3 1 1 3 6 3280
Greenwich (Washington Co.) NA NA NA NA NA 3290
Hamlin (Monroe Co.) NA NA NA NA NA 3174
Hurley (Ulster Co.) 0 0 0 0 4 3564
Kennedy (Chautauqua Co.) 0 1 3 0 4 3165
Kinderhook (Columbia Co.) NA NA NA NA NA 3549
King Ferry (Cayuga Co.) 0 0 0 1 1 3184
Kirkville (Madison Co.) NA NA NA NA NA 3270
Lyndonville (Orleans Co.) 0 0 1 0 56 3122
New Paltz (Ulster Co.) NA NA NA NA NA 3784
Oswego (Oswego Co.) 0 0 1 1 21 2909
Owego (Tioga Co.) 0 3 4 0 0 3254
Penn Yan (Yates Co.) 0 0 1 0 0 3221
Peru (Clinton Co.) NA NA NA NA NA 3097
Plattsburgh (Clinton Co.) NA NA NA NA NA 3163
Plessis (Jefferson Co.) 0 0 0 0 22 3045
Portville (Cattaraugus Co.) NA NA NA NA NA 3036
Preble (Cortland Co.) NA NA NA NA NA 2872
Ransomville (Niagara Co.) 0 0 0 0 10 3238
Schaghticoke (Rensselear Co.) NA NA NA NA NA 3456
Seneca Castle (Ontario Co.) 19 0 0 0 2 3212
Sharon Springs (Schoharie Co.) NA NA NA NA NA 3175
Sherwood (Cayuga Co.) 0 0 2 5 2 3204
South Colton (St. Lawrence Co.) 1 1 0 4 15 2791
Stone Ridge (Ulster Co.) NA NA NA NA NA 3538
Tivoli (Dutchess Co.) NA NA NA NA NA 3708
Unadilla (Delaware Co.) 0 0 23 0 10 2865
Williamson (Wayne Co.) 0 0 0 0 0 3017
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
trap catches for the week of 8.13.19 – 8.20.19



Dry Bean Western Bean Cutworm Alert
8.20.19
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. Avoca H, Avoca W, South Caledonia, Stafford and Wayland have all reached >50 cumulative moth trap catch and nearby corn should be scouted for egg masses and damage. Peak WBC flight historically occurs the last week of July into early August but seems to be delayed by a few weeks this year. 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.

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.

2019 WBC trap locations.

Location of WBC traps near Dry Beans in 2019.

Dry Bean Location 7.23.29 7.30.19 8.6.19 8.13.19 8.20.19 Cumulative WBC
Avoca H (Steuben Co.) 37* 37* 69 11 1 156
Avoca W (Steuben Co.) 19* 19* 36 25 12 101
Caledonia South (Livingston Co.) 0 44 20 14 14 92
Caledonia Southwest (Livingston Co.) 11 8 10 13 5 47
Geneva (Ontario Co.) 2 10 1 13 19 45
Riga (Monroe Co.) 17 61 80 83 62 303
Stafford (Genesee Co.) 5 28 23 23 15 94
Wayland (Steuben Co.) 40.5* 40.5* 73 108 31 298
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