Sweet corn moth trap numbers for VA counties – week of July 24, 2017

Sweet corn farms are being monitored around Virginia for the two most important pests attacking the ears, corn earworm and fall armyworm.  Moth Trap Catch Data are being recorded by:  Katlyn Catron  (Montgomery Co.); Jason Cooper (Rockingham Co.); Ursula Deitch (Northampton Co.); Helene Doughty (Accomack Co. & Virginia Beach); Kenner Love (Rappahannock Co.); Laura Maxey Nay (Hanover Co.); Steve Pottorff (Carrol Co.); Stephanie Romelczyk  (Westmoreland Co.); Laura Siegle (Amelia Co.); Rebekah Slabach (Halifax Co.); and Mark Sutphin (Frederick Co.).

This week we observed some big jumps in corn earworm moth catch at some locations such as the Bridge Tunnel in Northampton County, the ESAREC in Accomack Co., and Hanover Co.   We still have not seen very many  fall armyworm moths yet, only a few moths here and there in VA. For corn earworm, moth trap catch of less than 1 per night means  low pest pressure and sweet corn sprays can probably be spaced 5-6 days apart during silking.  However, a catch of >1 or >13 moths per night means moderate and high pest pressure, respectively, and a more frequent spray interval (every 3 or 2 days) is justified.  Here are the trap catch results (moths per night) for several locations around Virginia for this week (note we do not have data for all locations):

Week of July 24 (avg)
Region County Field CEW/night FAW/night
Eastern Shore Accomack ESAREC – cemetery 9.6 1
Eastern Shore Accomack ESAREC – woods 3.4 0
Eastern Shore Accomack ESAREC – sweet corn 4.6 0
Eastern Shore Northampton Bridge Tunnel 60.4 NA
Eastern Shore Northampton Capeville 1 2.1 0
Eastern Shore Northampton Cape charles 6.3 NA
Eastern Shore Northampton Eastville 10.6 1
Eastern Shore Northampton Nassawaddox 0.1 1
Virginia Beach Virginia Beach Pungo 1 11.9 1
Piedmont Amelia Field 1 NA NA
Piedmont Hanover Farm 1 11.0 0.0
Piedmont Hanover Haynes 3.9 0.0
Northern Neck Westmoreland Field 1 6.3 0
Northern Neck Westmoreland Field 2 NA NA
Shenandoah Valley Rappahannock Field 1 0.6 0
Shenandoah Valley Page Field 1 1.7 0
Shenandoah Valley Frederick Farm 1 1.4 1
Shenandoah Valley Frederick Farm 2 5.2 0
Shenandoah Valley Rockingham Farm 1 0.7 1
Shenandoah Valley Rockingham Farm 2 NA NA
New River Valley Montgomery KC 0.0 0
New River Valley Montgomery KO1 2.0 1
New River Valley Montgomery KO2 6.0 1
New River Valley Montgomery WF1 1.0 NA
New River Valley Montgomery WF2 0.0 NA
New River Valley Montgomery WF3 4.0 NA
New River Valley Montgomery WS1 0.0 NA
New River Valley Montgomery WS2 1.0 NA
New River Valley Montgomery WS3 1.0 NA

This project is sponsored by a Specialty Crop Block Grant by VDACS.