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Control of Spider Mites in Cotton with Selected Insecticides, 1985


 Three separate field studies were conducted in the Delta region of Mississippi to study the relative efficacy of several insecticides for spider mite control. Since the species of mites were not determined, we assumed that the populations were predominantly composed of Tetranychus urticae. All 3 studies were conducted on grower farmers where spider mites were found at measurable levels. In each test the plot size was 2 rows × 50 ft. Applications were applied on 15 Jul in Test I and on 19 Jul in Test II with a CO2 powered back-pack sprayer equipped with 2 TX-4 nozzles/row. Posttreatment counts were made on 18 and 29 Jul, respectively. Spray volume delivered was ca. 5.0 gpa. Treatments in Test III were applied on 21 Jul with a John Deere high clearance sprayer equipped with 2 TX-4 nozzles/row that delivered a spray volume of ca. 3.0 gpa. Posttreatment counts were made on 27 Jul. In all 3 tests the aphid population prior to treatment was estimated to be between 300-400 mites/10 upper leaves. Posttreatment observations for the 3 studies were made at different times due to variable weather conditions and cultural activities. However, all 3 studies were evaluated using the same scouting procedures. Ten upper leaves were collected at random in each plot, and each leaf was classified as having (1) 0 mites, (2) 1-5 mites, (3) 6-15 mites, (4) 16-25 mites, or (5) 25+ mites. For purposes of comparing the various treatments, the data were converted to estimated number of mites/10 upper leaves by multiplying the mid-point of each classification by the number of observations for that classification.