PestWatch Report for September 4, 2019

Sep 06, 2019

Corn earworm captures continued to be high in most locations, although southwestern sites stayed low.

Sites exceeding 70 moths/week, suggesting a tight (3–4) day spray interval occurred in Erie, Mifflin, Northampton, and Union Counties. Sites with 36–70 moths/week, suggesting a 4–5 day interval, were reported in in Bucks, Centre, Juniata, Lancaster, Lycoming, and York Counties.

Additional sites had lower counts but still above a spray threshold. Six sites stayed below threshold. Populations carrying pyrethroid resistance tends to increase in August.

Non-pyrethroid options include Coragen, Blackhawk, and Radiant, however these will not control sap beetles, BMSB, or insects feeding on silk (Japanese beetles, adult corn rootworms). Adding a pyrethroid, or the premix Besiege, should help with pests that are not “worm” species.

European corn borer (ECB) counts are very low. Sprays targeting CEW will control ECB.

Fall armyworm (FAW) captures continued to be very high in Erie County, and increasing in central Pennsylvania (Blair, Butler, Centre, Indiana, Mifflin, and Union Counties). A non-target called Intermediate Cucullia, or Intermediate Hooded Owlet, is also showing up in the FAW traps.

Average weekly catch: 7-day moving average. The average catch per night (catch, divided by the number of nights trapping), divided by the number of nights where data exist, multiplied by 7. Weeks where all the average-catch-per-night values are nulls are treated as if no data exist for that week.

County	Town/Farm	CEW	CEW	CEW	ECB	ECB	ECB	FAW	FAW	FAW
		21-Aug	28-Aug	4-Sep	21-Aug	28-Aug	4-Sep	21-Aug	28-Aug	4-Sep
Blair	Curryville	21	23	null	0	0	null	0	0	null
Blair	Tyrone	45	51	null	0	0	null	null	21	null
Bradford	Sechrist Farm	0	8	6.1	2	2	0	0	null	null
Bucks	Bedminster	220	168.9	54.6
Bucks	Buckingham	75	125	null	6	3	null
Butler	Cabot	null	11.2	25				null	8.4	15
Centre	Harner	58	113	57	2	13	2	2	13	2
Centre	Rock Springs	9.8	32	20	1	1	2	1	3	9
Clinton	Loganton	1.8	19	null	10.5	5	null
Erie	Dudas Farm	39	42	19.3				20	54	84
Erie	Mason	56	55	106.8				35	300	259
Indiana	Brush Valley	8	14	12				0	4	6
Indiana	Creekside	3	13	18	0	0	1	5	19	12
Juniata	Brummer	12	52.5	43.8	0	2.3	0	0	0	null
Lancaster	Landisville	25.7	20	24.5	3.5	2	0	0	0	0
Lancaster	Neffsville	56	54	39.4	0	1	0.9	0	0	2.6
Lancaster	New Danville	111	175	null	0	0	null	5	1	null
Lehigh	Germansville	6	null	7	1	null	0	0	null	0
Luzerne	Drums	41	28	2	0	4	1	0	2	0
Luzerne	Plains	21	24	null	0	0	null
Lycoming	Linden	null	28	12				null	0	1
Lycoming	Montoursville	null	23.6	36				null	0	2
Lycoming	Muncy	null	42.9	38				null	0	0
Mifflin	Streamside	165	225	170.6	3	3	0	5	5	17.5
Montour	Washingtonville	20	null	null	4	null	null
Northampton	Nazareth	46.4	72.3	88.4	0	1.2	0	0	0	0
schuylkill	Tower City	45	108	null	2	5	null	0	0	null
Susquehanna	LaRue Farm	0	4	4	13	3	3	null	null	0
Union	Oberholtzer	78	103	202	4	1	0	3	8	32
Washington	Venetia	10	19	21
Westmoreland	Schramms	null	22.5	null	null	8	null
York	York	60	45	52.5	0	1	0	4	2	0

Thresholds: Reproductive (tassel/silk) and late vegetative corn attracts moths. Shorten spray schedules when populations increase. If CEW is not a problem, then consider ECB.