SPRAY TABLE EVALUATION OF MITICIDES
FOR TWO-SPOTTED SPIDER MITES ON COTTON
by
Dan Martin, J Lopez, Y Lan
Contact: Dan Martin
Research Engineer
Aerial Application Technology Research
Project
USDA-ARS
2771 F&B Road
College Station, TX 77845
Or
Juan D. Lopez
USDA-ARS, Southern
Plains Agricultural Research Center,
Areawide Pest Management Research Unit
College Station, TX
Summary: Two-spotted spider mites, Tetranychus urticae Koch, are
important pests on numerous field and horticultural
crops in the U.S. and worldwide.
Although this mite species has always been a pest on cotton especially
in drier areas and more recently in the mid-South areas of the Cotton Belt,
limited information is available on efficacy of aerially-applied miticides. Bioassay
research initiated last year was continued and expanded to include the use of GreenSeeker™ Technology to assess treatment differences
when miticides at different rates were applied to
mite-infested cotton using the spray table.
Mite sampling was also conducted by collecting half leaf samples from
the different treatments and counting the number of mites. Treatment rates evaluated for each miticide were 1/8, ¼, ½, and all of the
lowest recommended rate on the label.
Untreated controls included both infested and noninfested
cotton. Miticide
deposition data were also collected for the different treatments using water
sensitive paper exposed during application and analyzed with the Droplet Scan™
software. Results of this research will
be presented and discussed relative to miticide
efficacy.
Select
for a copy of the Presentation Slides.