NY Sweet Corn Trap Network Report 8.11.20 | Sweet Corn Pheromone Trap Network Report

Thirty-four sites reported this week. Nine of the sites had European corn borer (ECB)-E and two sites had ECB-Z. Sixteen sites reported corn earworm (CEW) with fourteen high enough to be on a 3, 4, 5 or 6 day spray interval (see table at bottom of post). Fall armyworm (FAW) was caught at eleven sites and Western bean cutworm (WBC) was caught at twenty-seven sites. The hybrid ECB moth was caught at two of the five reporting sites.

Peak flight of WBC occurred last week (see graph below), with the majority of sites now at >90% flight completion according to the Hanson et al. model.

NEWA Western bean cutworm flight emergence lookup table.

Average sweet corn trap catches from 5.26.20 – 8.11.20

Average sweet corn trap catches for all reporting sites from 5.26.20 – 8.11.20.

Both CEW and FAW increased this week. At sites where CEW are being caught in high enough numbers to determine the spray schedule, those applications will be sufficient to take care of other worm pests that are present. Where CEW are not determining the spray schedule, scout to be sure that FAW and WBC are not above threshold.

: Fall armyworm egg mass.

: Fall armyworm larva, note the inverted ‘Y’ om head capsule.

: Feeding damage. Photo: Darcy Telenko

: WBC egg mass.

: WBC larvae just after hatching Photo: Tom Cowan

: Later instar WBC larva, note the two dark bands behind the head capsule. Frank Peairs, Colorado State University

Location	ECB-E	ECB-Z	Hybrid	CEW	FAW	WBC	DD
Western NY trap Catch
Attica (Wyoming Co.)	0	0	NA	1	0	2	3028
Baldwinsville (Onondaga Co.)	3	0	NA	8	6	28	3160
Batavia (Genesee Co.)	0	0	NA	0	0	12	3098
Bellona (Yates Co.)*	0	0	0	1	11	14	3134
Brockport (Monroe Co.)	0	0	NA	0	0	3	3207
Eden (Erie Co.)	0	0	NA	5	46	22	3107
Farmington (Ontario Co)*	0	NA	0	0	0	0	3208
Geneva (Ontario Co.)*	NA	NA	NA	NA	NA	NA	3141
Hamlin (Orleans Co.)	0	2	NA	9	0	12	3104
Kennedy (Chautauqua Co.)	NA	NA	NA	NA	NA	NA	2947
King Ferry (Cayuga Co.)	0	0	NA	6	6	14	2993
Kirkville (Madison Co.)	0	0	NA	0	0	2	3104
LeRoy (Genesee Co.)	2	0	NA	0	0	2	3081
Lyndonville (Orleans Co.)	0	0	NA	0	0	43	3024
Oswego (Oswego Co.)	0	0	NA	3	0	28	2877
Panama (Chautauqua Co.)	NA	NA	NA	NA	NA	NA	2769
Penn Yan (Yates Co.)*	0	0	1	0	0	3	3038
Portville (Cattaraugus Co.)	1	0	NA	0	0	8	2741
Preble (Cortland Co.)	0	0	NA	0	0	0	2678
Ransomville (Niagara Co.)	0	0	NA	0	1	11	3142
Seneca Castle (Ontario Co.)*	0	0	1	0	0	1	3076
Sherwood (Cayuga Co.)	0	0	NA	4	3	2	3035
Williamson (Wayne Co.)	0	0	NA	0	0	0	2924
Eastern NY trap Catch
Amsterdam (Fulton Co.)	NA	NA	NA	NA	NA	NA	2961
Feura Bush (Albany Co.)	0	0	NA	NA	0	0	3256
Florida (Orange Co.)	0	0	NA	94	72	6	3396
Greenwich (Washington Co.)	0	1	NA	19	0	1	3169
Hurley (Ulster Co.)*	7	0	0	49	1	5	3370
Kinderhook (Columbia Co.)	0	0	NA	28	5	6	3284
Melrose (Rensselear Co.)	0	0	NA	13	0	0	3200
Middleburgh (Schoharie Co.)	NA	NA	NA	NA	NA	NA	3265
New Paltz (Ulster Co.)	1	0	NA	NA	NA	1	3448
Peru (Clinton Co.)	1	0	NA	0	0	121	3006
Plattsburgh (Clinton Co.)	6	0	NA	0	2	154	3065
Plessis (Jefferson Co.)	0	0	NA	0	0	40	3133
South Colton (St. Lawrence Co.)	NA	NA	NA	NA	NA	NA	2743
Stone Ridge (Ulster Co.)	3	0	NA	7	NA	NA	3201
Ticonderoga (Essex Co.)	1	0	NA	0	0	60	3066
Tivoli (Dutchess Co.)	0	0	NA	10	NA	NA	3416
Unadilla (Delaware Co.)		0	NA	51	2	22	2704
ECB – European Corn Borer CEW – Corn Earworm FAW – Fall Armyworm WBC – Western Bean Cutworm NA – not available DD – Degree Day (base 38) March 1st accumulation Climate Smart Farming
trap catches for the week of 8.4.20 – 8.11.20

Dry Bean Western Bean Cutworm Alert
8.11.20
Marion Zuefle, NYS IPM Program and Margie Lund, CVP
(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 or 7-10 days after peak emergence, and should continue to scout for three weeks, especially if damage has been seen in recent years. WBC lays eggs on pretassling corn, but if corn is already passed the tassel stage they will begin to lay eggs on dry beans.

Location of WBC traps near Dry Beans in 2020.

Dry bean pod scouting should begin 7-10 days after peak emergence (given in blue below), in those fields which have accumulated over 50 moths/trap, near fields with high trap counts, or where WBC has been found in bean pods/seeds in recent years.

Dry Bean Location	7.7.20	7.14.20	7.21.20	7.28.20	8.4.20	8.11.20	Cumulative WBC
Avoca Hill (Steuben Co.)	0	0	23	67	80	21	191
Avoca Valley (Steuben Co.)	1	0	6	44	94	43	188
Caledonia South (Livingston Co.)	0	0	6	54	58	32	150
Caledonia Southwest (Livingston Co.)	0	0	8	100	101	48	257
Geneva (Ontario Co.)	0	2	13	38	42	52	95
Riga (Monroe Co.)	0	1	24	49	28	17	119
Stafford (Genesee Co.)	1	1	18	41	34	5	95
Wayland (Steuben Co.)	0	2	4	24	92	38	160
Western Bean Cutworm trap counts by date.

WBC eggs, laid shortly after moth emergence, take 5-7 days to hatch. 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.

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.