PestWatch Report on August 9, 2017

Although CEW are low in most locations, captures can change rapidly at this time of year.
PestWatch Report on August 9, 2017 - News

Updated: October 5, 2017

PestWatch Report on August 9, 2017

Spray thresholds for CEW are being exceeded in Erie and Lancaster Counties. ECB and FAW counts are low. Also be aware that brown marmorated stink bug tends to move into sweet corn in August.

Corn earworm (CEW) counts have decreased in the last week, although not in Erie County. Populations may be getting diluted into nearby field corn if that field corn is silking. The most recent counts suggest sites at a 4-5 day interval in Erie County. and sites at either 4-5, or 5-6 day spray interval in Lancaster County. Counts can change rapidly at this time of year.

European corn borer (ECB) counts are low.

Fall armyworm (FAW) counts are also low, except in Erie County.

COUNTYFARM/TRAP NAMECEW
25-Jul
CEW
1-Aug
CEW
8-Aug
ECB
25-Jul
ECB
1-Aug
ECB
8-Aug
FAW
25-Jul
FAW
1-Aug
FAW
8-Aug
BlairCurryville, PA (Blair)500000300
BlairHollidaysburg, PA (Blair)5001100000
BlairTyrone, PA (Blair)356null70null56null
BradfordBristol's Produce0null00null2.1nullnull1.4
BradfordLarue's Producenullnull0nullnull1.5nullnull4.2
BradfordShores Sisters Produce0null00null9.1
BucksBedminster007000
BucksBuckinghamnull7nullnull23.5null
CentreHarner1.221.815.200.91.210
CentreRock Springs33.82.635.825.38.282.6
CentreStormstown15.225.31.2007166.1
ClintonLoganton4.7null216.3null10.5
ErieDudas Farm1760491
ErieMason745338301822
FayetteDuda's Farm Inc.4217null110null200null
HuntingdonNew Morning Farm5.314778.8494.7
IndianaBrush Valley120000614
IndianaCreekside3200220
LackawannaRansomnull0nullnull3null
LancasterLandisville70162710000
LancasterNeffsville3null183null00null0
LancasterNew Danville61442374020
LehighGermansville76182000435
LuzerneDrums101640
LuzernePlains20null42null
LycomingLinden101212
LycomingMontoursville8481111
LycomingMuncy7111123
MontourMontour1null27null0
NorthamptonNazareth2null00null0.90null0
SchuylkillTower City200000047
WashingtonVenetia23107
WestmorelandSchramms Farms and Orchardnull18.7nullnull3.7null
YorkYork7null3.524null41null0

Thresholds

Reproductive (tassel/silk) and late vegetative corn attracts moths. Shorten spray schedules when populations increase.

Thresholds Based on CEW Captures

LevelsCEW catch / weekSpray frequency
almost absent1-134 days to no spray
very low14-355 to 6 day
low36-704 to 5 day
moderate71-3493 to 4 day
high> 3502 to 3 day

If CEW is low, then consider ECB

LevelsECB catch / weekSpray frequency
almost absent< 14no treatment
very low15-356 day
low38-705 day
moderate> 704 day
high

Instructors

Insect population dynamics IPM

More by Shelby Fleischer, Ph.D.