PestWatch Report for August 7, 2019

Aug 09, 2019

Data are coming from sites where sprays are applied, which may have reduced counts at those sites that were high last week. Within the last two weeks, 12 of 32 reporting sites exceeded spray thresholds. Most suggest a 5-6 day interval, but a site in Lancaster county suggest a 3-4 day interval. Pyrethroid resistance in corn earworm (CEW) can reduce efficacy when solely relying on pyrethroids for CEW control. Damage has also occurred from sap beetles. Sap beetles (also called picnic beetles) build up populations in farms with ripe or over-ripe fruit nearby. Relying on “worm” materials (Coragen, Blackhawk, Radiant) is not expected to control sap beetles. Adding a pyrethroid, or the premix Besiege should help with sap beetles.

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

Fall armyworm (FAW) captures are low but are now showing up at multiple sites. Positive counts were recorded in 8 sites.

Average weekly catch

A moving average for the last seven days. 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
		24-Jul	31-Jul	7- Aug	24-Jul	31-Jul	7- Aug	24-Jul	31-Jul	7- Aug
Blair	Curryville	3	null	1	0	null	0	0	null	0
Blair	Tyrone	6	null	15	0	null	0	0	null	0
Bradford	Sechrist Farm	null	8	1	null	16	13	null	1	2
Bucks	Bedminister	null	10	null
Bucks	Buckingham	20	14	70	10	11	8
Butler	Cabot	3	5	null				null	0	null
Centre	Harner	2	5	4	27	26	0	2	4	5
Centre	Rock Springs	2.7	6.3	4.6	6.5	1	1.5	1.5	0	1
Clinton	Loganton	1.1	0.9	0	14.5	8.8	2
Erie	Dudas Farm	53	12	21				1	1	0
Erie	Mason	26	81	2				15	13	10
Indiana	Brush Valley	0	1	1				0	0	0
Indiana	Creekside	61.3	16.8	8	null	0.5	0	1.8	2.8	2
Juniata	Brummer	null	4.2	14	null	null	5.8	null	0	0
Lackawanna	Ransom	null	null	null	null	null	null
Lancaster	Landisville	18	1	null	1	1	3	0	0	0
Lancaster	Neffsville	3	19	11	3	0	1	0	0	0
Lancaster	New Danville	17	42	106	3	2	0	0	0	6
Lehigh	Germansville	0	1.8	3	3	0	null	0	0	0
Luzerne	Drums	7	4	null	20	6	null	null	null	null
Luzerne	Plains	0	0	null	0	0	5
Lycoming	Linden	null	0	null				null	0	null
Lycoming	Montoursville	null	4.7	17				null	0	5
Lycoming	Muncy	null	3.9	6				null	0	0
Mifflin	Streamside	32.5	115	22				0.5	0	0
Montour	Washingtonville	null	0	7	null	1	3
Northampton	Nazareth	0	0	null	0.5	1	null	0	0	null
Schuylkill	Tower City	0	null	0	0	null	0.5	0	null	0
Susquehanna	LaRue Farms	null	4	6	null	8	0	null	0.5	null
Union	Ernie Oberholtzer's Farm	9	1	3	null	1.5	6	0	0	0
Washington	Venetia	60	33	17
Westmoreland	Schramms Farm and Orchard	22.9	null	null	0	null	null
York	York	1	9	24	4	0	0	3	1	1

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.