Laboratory Evaluation of Acaricides (III) for Control of Tetranychus Urticae (Koch), 1987

Six treatments were tested for relative efficacy against twospotted spider mite in cotton planted 8 May at the Plant Science Research Farm, Mississippi State University, Mississippi State, Miss. Leaves were collected from several fields wherever they could be located. Mites were counted and sorted via computer into series with relatively equal numbers and arranged in a randomized complete block design with 5 replications. Treatments were applied to the abaxial surface of the leaves in a laboratory spray chamber calibrated for 11.5 gal/acre at 1.3 mph using a single TX-3 nozzle. The leaves in the untreated check were sprayed with water. Applications were made on 14 Sep. All plots from which leaves were obtained had received insecticide treatments for nontarget pests as needed during the season. Eggs and mites were counted on 3 locations/leaf via dissection microscope (by each lobe and by the nectary).