PestWatch Report on August 2, 2017

Although corn earworm dropped somewhat, counts are hovering above a 5-6 day threshold, and reaching a 4-5 day threshold in Erie.
PestWatch Report on August 2, 2017 - News

Updated: August 31, 2017

PestWatch Report on August 2, 2017

European corn borer is in its 2nd generation, and fall armyworm immigration is occurring.

Corn earworm (CEW)

CEW is present throughout the state. Counts dropped since last week, but in Erie are exceeding 4-5 day spray intervals, and sites in Fayette, Lancaster, Lehigh and Westmoreland counties suggest 5-6 day spray intervals. It's possible that the presence of silking field corn is helping dilute the moth counts.

European corn borer (ECB)

ECB is in its 2nd generation. Counts are high in Huntington county. York and Clinton counties had high counts last week.

Fall armyworm (FAW)

We continue to see low rates of trap capture, with an increasing number of sites, especially in Centre, Blair and Erie counties.

Current Trap Counts

Average weekly catch - a 7-day moving average of the average catch/night.

COUNTYFARM/TRAP NAMECEWECBFAW
18-Jul25-Jul1-Aug18-Jul25-Jul1-Aug18-Jul25-Jul1-Aug
BlairCurryville, PA350600230
BlairHollidaysburg, PA0500110000
BlairTyrone, PA3356070256
BradfordBristol's Produce00null00null
BradfordLarue's Produce0nullnull7nullnull
BradfordShores Sisters Produce00null00null
BucksBedminster000000
BucksBuckingham0null711null23.5
CentreHarner41.22015.2001.21
CentreRock Springs1.633.82.605.8238.28
CentreStormstown1115.2201.200716
ClintonLoganton2.64.7null16.616.3null
ErieDudas Farmnull176null49
ErieMasonnull7453null3018
FayetteDuda's Farm Inc.8421751100200
HuntingdonNew Morning Farmnull5.314null78.849
IndianaBrush Valley312null00061
IndianaCreeksidenull320null22
LackawannaRansomnullnull0nullnull3
LancasterLandisville1670127000
LancasterNeffsvillenull3nullnull3nullnull0null
LancasterNew Danville4614637002
LehighGermansville177618000043
LuzerneDrumsnull10null64
LuzernePlainsnull20null42
LycomingLinden0103.121
LycomingMontoursville084011
LycomingMuncy4.77111.212
MontourMontour11null37null
NorthamptonNazareth02null00null00null
SchuylkillTower City120100004
WashingtonVenetia472310
WestmorelandSchramms Farms and Orchard21.5null18.70.9null3.7
YorkYork37null3124null11null

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.