I have received several reports from Virginia Beach and Chesapeake of armyworms infesting wheat and hay in large numbers. Neighboring regions of NC are experiencing similar outbreaks.
Overall, these infestations are rare in our state, but scouting is recommended. Fields treated previously with pyrethroids may be at higher risk because they contain fewer natural enemies to combat pest outbreaks. Armyworms feed at night and may be found under residue and at the base of plants during the day. Oftentimes, they can be seen curled into a c-shape (see photos below). Thresholds are one larvae (0.75 in or longer) per linear foot in barley and 2-3 per foot in wheat. Refer to Chapter 4 of Virginia Tech’s “Pest Management guide: Field Crops” for products and rates labeled for armyworm control in our state. Pay attention to PHI before making an application. Pyrethroids can be effective against armyworm. Good coverage is critical, especially in high residue fields.
Photos courtesy of JB Rigg, Helena Chemical.
The EPA has granted a Section 18 for the use of Transform WG (50% a.i. sulfoxaflor) on sorghum for managing sugarcane aphid in certain counties in Virginia. The expiration date is November 30, 2018. All applicable directions for use, restrictions, and precautions on the label, and Worker Protection Standards, must be followed except as modified in the Section 18 document. In part, the Section 18 lists a foliar application rate of 0.75-1.5 oz of product per acre, with a maximum of 2 applications per year, resulting in a seasonal maximum application rate of 3.0 oz of product per acre per year. Please be sure to read and follow the entire label and Section 18. Thanks to the Virginia Department of Agriculture and Consumer Services, Office of Pesticide Services, for their assistance.
Average nightly black light trap catches of corn earworm moths this week were: Southampton=0.3; Prince George (Templeton)=6; Prince George (Disputanta)=4; Hanover=2; Suffolk=26. Here is the data table: BLT_28_Sep_2017
Most traps are being stowed now. We greatly appreciate the reports this season from Watson Lawrence (Chesapeake); Mike Parrish and Angela Duncan (Dinwiddie); Laura Maxey-Nay (Hanover); Scott Reiter (Prince George); Mary Beahm (Warsaw); LIvvy Preisser (Southampton); and Sally Taylor and her entomology team (Suffolk). We also want to thank the growers who hosted the traps on their farms.
Average nightly captures of corn earworm moths in area black light traps were as follows: Suffolk=8; Southampton=1; Warsaw=20; Prince George (Templeton)=10; Prince George (Disputanta)=5. There were no reports of any brown marmorated stink bugs caught in the black light traps this week. Here is the corn earworm data table: BLT_21_Sep_2017
Due to impending rain Tuesday and Wednesday and already saturated soils, the Eastern Shore AREC field day scheduled for Wednesday, September 13, 2017 has been canceled. Let’s hope Hurricane Irma keeps tracking further west. We certainly do not need any more rain!
Most reporting black light trap stations this week had decreased corn earworm moth captures (except for Chesapeake remaining constant). Nightly averages were Chesapeake = 11; Southampton = 1; Suffolk = 8; and Warsaw = 4 moths. Here is the data table: BLT_7_Sep_2017
No brown marmorated stink bugs were caught this week in the black light traps.
Please join us for Virginia Tech’s Eastern Shore Agricultural Research and Extension Center (ESAREC) 2017 Research Field Day on Wednesday, September 13th. Registration is free, open to the public and will begin at 8:00 AM at the ESAREC complex located at 33446 Research Drive, Painter, Virginia 23420. The field tour will begin at 9:00 AM and conclude with lunch at 12:30 PM. See the attached flyer for specific projects to be highlighted and more information.
If you would like more information or are interested in sponsoring this event, please contact Lauren Seltzer at 757-414-0724 ext. 11 or email at email@example.com.
2017 ESAREC Field Day Announcement
This week, corn earworm (bollworm) moth captures in the black light trap were down at most locations (steady at Chesapeake and Prince George-Templeton), perhaps partly due to the rainy weather, but some “down” numbers are still pretty high (Suffolk, for example). The table is here: BLT_31_Aug_2017
We had no reports of any brown marmorated stink bugs captured in the black light traps this week.
We have vial-tested close to 1,000 corn earworm moths in Dr. Taylor’s pyrethroid resistance monitoring program in 2017, with an average of 38% survival.
NIghtly trap averages for corn earworm moths had a wide range this week–please see the attached pdf file for your most local data: CEW_24_Aug
Corn earworm moth captures in the black light traps ranged from 2 to 45 moths per night; brown marmorated stink bug catches ranged from zero to 2.6 per night. Here are the data tables: BLT_17_Aug_2017
In our corn earworm (bollworm) vial tests, we are averaging 39% moth survival, with 832 moths tested to date.