PestWatch Report for September 4, 2019

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.
 
CountyTown/FarmCEWCEWCEWECBECBECBFAWFAWFAW
  21-Aug28-Aug4-Sep21-Aug28-Aug4-Sep21-Aug28-Aug4-Sep
BlairCurryville2123null00null00null
BlairTyrone4551null00nullnull21null
BradfordSechrist Farm086.12200nullnull
BucksBedminster220168.954.6      
BucksBuckingham75125null63null   
ButlerCabotnull11.225   null8.415
CentreHarner581135721322132
CentreRock Springs9.83220112139
ClintonLoganton1.819null10.55null   
ErieDudas Farm394219.3   205484
ErieMason5655106.8   35300259
IndianaBrush Valley81412   046
IndianaCreekside3131800151912
JuniataBrummer1252.543.802.3000null
LancasterLandisville25.72024.53.520000
LancasterNeffsville565439.4010.9002.6
LancasterNew Danville111175null00null51null
LehighGermansville6null71null00null0
LuzerneDrums41282041020
LuzernePlains2124null00null   
LycomingLindennull2812   null01
LycomingMontoursvillenull23.636   null02
LycomingMuncynull42.938   null00
MifflinStreamside165225170.63305517.5
MontourWashingtonville20nullnull4nullnull   
NorthamptonNazareth46.472.388.401.20000
schuylkillTower City45108null25null00null
SusquehannaLaRue Farm0441333nullnull0
UnionOberholtzer781032024103832
WashingtonVenetia101921      
WestmorelandSchrammsnull22.5nullnull8null   
YorkYork604552.5010420
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.
 
Thresholds Based on CEWCatch Per WeekSpray Frequency (Days)
Almost absent1–137+
Very low14–355–6
Low36–704–5
Moderate71–3493–4
High> 3502–3
Thresholds Based on ECBCatch Per WeekSpray Frequency (Days)
Almost absent< 147+
Very low15–356
Low36–705
Moderate> 704
 
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