Captures of corn earworm (=bollworm) moths decreased this week in our black light traps. The average number of moths caught per night was: Dinwiddie = 2; Greensville = 6; Prince George-Templeton = 1; Prince George-Disputanta = 2; Suffolk = 13. Here is the Table. In our unsprayed, conventional (non-Bt) cotton plots at the Tidewater Agricultural Research and Extension Center in Suffolk, we had 11% boll injury due to bollworm feeding this week. Adult cypermethrin (pyrethroid insecticide) vial tests have 29% moth survival with 796 moths tested in 2021.
Corn earworm (=bollworm) moth catches continued to increase this week in our black light traps. The average number of moths caught per night was: Greensville = 26; Prince George-Templeton = 25; Prince George-Disputanta = 25; Southampton = 15; Suffolk = 46. Here is the Table.
Corn earworm (=bollworm) moth catches continued to increase this week in our black light traps. The average number of moths caught per night was: Greensville = 10; Prince George-Templeton = 26 (Scott Reiter reported this trap is next to some early April-planted corn that the shucks are starting to dry down on); Prince George-Disputanta = 6; Southampton = 10; Suffolk = 27. Here is the Table. We found bollworm eggs in cotton in Greensville and Suffolk this week. The 2021 season average in our adult cypermethrin vial tests is 25% survival (562 moths tested).
Black light trap captures of corn earworm moths (average number per night) in southeast Virginia this week were: Prince George-Templeton=0.7; Prince George-Disputanta=0.9; Southampton=2.0; Suffolk=4.0.
Our pyrethroid (cypermethrin @ 5 micrograms per vial rate) vial tests currently have 14% of corn earworm moths surviving the 24-hour exposure period (n=243 moths tested).
In the past weeks, a few strawberry growers have expressed their concern about the possibility of cyclamen mite infestations. After visiting some strawberry farms in the Chesapeake area this week, I found symptoms of cyclamen mite damage in a few fields. Because of the small size of the mites, I took leaf samples from the symptomatic plants and confirmed the presence of the mites in the laboratory.
The cyclamen mite is a serious pest of strawberries. It has been reported in most strawberry-producing states. Cyclamen mites are tiny mites (0.001 in long) that feed on the tissue of nonexpanded and newly unfolded leaves in the strawberry plants. Adults and immatures of the cyclamen mite are considerably smaller than two-spotted spider mites and cannot be easily seen with the naked or a hand lens. Symptoms of cyclamen mite infestation include severely crumpled and crinkled leaves, as well as stunted plants.
The presence of cyclamen mites was confirmed mostly on ‘Ruby June’ strawberries, but they can infest any strawberry cultivar. Strawberry growers in the Virginia Beach metropolitan area and the eastern shore should beware of the presence of this pest mite in their field. There are very few miticides available for the control of cyclamen mites. Unfortunately, the same products used for the control of two-spotted spider mites do not always provide control for cyclamen mites. The best performing product against this pest is Portal (fenpyroximate). Agri-mek (abamectin), is also labeled for cyclamen mites. Despite being miticides, Acramite and Magister are not labeled for control of cyclamen mite and may not provide enough protection against it.
Dr. Lorena Lopez
Department of Entomology
Virginia Tech | Eastern Shore Agricultural Research and Extension Center (ESAREC)
(954) 529 9042 | firstname.lastname@example.org
Corn earworm moth black light trap catches were low this week, averaging from 2 to 6 per night (Greensville=3; Hanover=2; Southampton=6; Suffolk=2). Most trap operators will be shutting off their traps by the end of this month. We greatly appreciate the efforts of cooperating growers, Virginia Cooperative Extension Agents Mike Parrish, Sara Rutherford, Laura Maxey-Nay, Scott Reiter, and Josh Holland, and Tidewater Agricultural Research and Extension Center’s Daniel Espinosa. TABLE
With the exception of Hanover, trap captures have declined since last week. The average nightly corn earworm/bollworm moth black light trap captures for this week (rounded) were: Greensville=18; Hanover=7; Prince George-Templeton=3; Prince George-Disputanta=2; Southampton=8; Suffolk=38. Thanks to our trap operators for their reports! TABLE
Average nightly corn earworm/bollworm moth black light trap captures for this week were: Greensville=28; Prince George-Templeton=5.5; Prince George-Disputanta=7; Southampton=17; Suffolk=76. Here is the Table
For soybean, here is the tool that calculates the corn earworm larval threshold number based on user input values for sampling techinque (sweep net or beat cloth), cost of insecticide application, price of beans, and row width: threshold calculator
We have done 391 vial tests so far this season, with 35% of moths surviving the 24-hour exposure to the pyrethroid cypermethrin at the rate of 5 micrograms per vial.
Average nightly corn earworm/bollworm moth black light trap captures for this week were: Dinwiddie=54; Greensville=15; Prince George-Templeton=13; Prince George-Disputanta=11; Southampton=22; Suffolk=92. Here is the Table
We have 37% survival in our cypermethrin vial tests (338 corn earworm moths tested from Suffolk, VA).