Spider Mites in Rose Plant Fields, Wasco, Ca, 1993

An evaluation was conducted with AC 303,630 on field-grown roses to be harvested as plants. Avid was included for comparison. Experimental design was a RCB with 6 replications. Blocks were single rows of roses planted 42 inches apart and plants were 6 inches apart within the row. Each plot was a 25 ft length of roses, with a 5 ft buffer between plots in the row. A single guard row separated each of the treated rows, and the entire plot was buffered by at least three untreated rows. Treatments were applied with a CO2 backpack sprayer at 30 psi with a TJ 8002 flat fan nozzle. Water was used at the rate equivalent to 100 gpa. Samples were 20 5-leafiet leaves pei plot taken at weekly intervals, transported to the lab, brushed onto glass plates, and counted in concentric fashion using a template. Data are the meat of replicates, and represent the spider mites counted on one-sixth of the plate. Pre-treatment samples were taken 26 May. Acaricides were applied 2" May under partly cloudy skies with temperature 25°C and wind velocity less than 5 mph.