PestWatch Report June 28, 2017

Updates on Corn earworm (CEW) and European corn borer (ECB).
PestWatch Report June 28, 2017 - News

Updated: August 31, 2017

PestWatch Report June 28, 2017

Corn earworm (CEW)

CEW was detected in 21 of 27 sites. Multiple sites throughout the state are exceeding 5-6 day spray intervals for silking corn, and sites in Centre and Westmoreland counties suggest even tighter schedules either this week or last week. Sites in the southern Hudson Valley are also high. Silking corn will strongly attract egg-laying females. This is dramatically higher than this time last year.

CountyTrap Name14-Jun21-Jun28-Jun
BlairTyrone, PA (Blair)null51null
BradfordBristol's Produce000
BradfordLarue's Producenull0null
BradfordShores Sisters Produce200
BucksBedminster000
CentreHarnernull04.7
CentreRock Springsnull1.62.5
CentreStormstownnullnull40.3
ClintonLogantonnullnull0
FayetteDuda's Farm Inc.null15null
HuntingdonNew Morning Farmnullnull18.7
IndianaCreeksidenull264
LackawannaRansomnullnull0
LancasterLandisville009
LancasterNeffsville1.269
LancasterNew Danvillenull2.5null
LehighGermansville2.34.722
LuzerneDrumsnull00
LycomingLindennull2null
LycomingMontoursvillenull20null
LycomingMuncynull2null
MontourMontour4.7null8
NorthamptonNazareth00null
SchuylkillTower Citynull1null
WashingtonVenetianull4735
WestmorelandSchramms Farms and Orchardnull27.1
YorkYork0328

European corn borer (ECB)

ECB sites in Bradford County and the northeast part of the state are exceeding spray thresholds. ECB counts are starting to decline, but adult counts have been high in the northeast. Larvae generated from those adults can be controlled with a spray timed at row tassel.

CountyTrap Name14-Jun21-Jun28-Jun
BlairTyrone, PA (Blair)null0null
BradfordBristol's Produce1055522
BradfordLarue's Producenull250.3null
BradfordShores Sisters Produce404317
BucksBedminster000
CentreHarnernull12.3null
CentreRock Springsnull0null
ClintonLogantonnullnull10.4
FayetteDuda's Farm Inc.null0null
HuntingdonNew Morning Farmnullnull2.3
IndianaCreekside000
LackawannaRansomnullnull7
LancasterLandisville3.5210
LancasterNeffsville1.248
LancasterNew Danvillenull0.5null
LehighGermansville4.711.721
LuzerneDrumsnull170
MontourMontour16.3114
NorthamptonNazareth516null
SchuylkillTower Citynull1null
WestmorelandSchramms Farms and Orchardnullnull12.6
YorkYork000

Average weekly catch--a moving average for the last 7 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.

PestWatch website

Spray count map legend

Fall armyworms (FAW)

At this time of year, capture is due to a non-target species called Leucania phragmatidicola (it does not have a common name).

Identifying Non-targets from Fall Armyworm Pheromone Captures

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.