Commercial Spray Trial with Bas 300 111 on Texas Citrus, 1994

Experimental BAS 300 1II was compared to the standard acaricides, Agri-Mek + NR 440 oil and Vendex, for efficacy against CRM. Treatments were randomized and replicated 3 times on plots of 4 trees each in an 8 yr old grapefruit orchard on a spacing of 15 × 24 ft. Treatment sprays were applied on 9 May using an FMC 1229 single volute commercial air blast sprayer operating at 1 mph, with nozzling and pressure calibrated to apply 250 gpa. At each count date, 50 fruit per replicate were randomly selected at arms length inside the tree canopy and examined for CRM in situ with a 10X handlens. All live CRM (except eggs) were counted in two, 1-cm2 lens fields on each fruit. The two counts per fruit were averaged and recorded as one observation. At harvest, 50 randomly sampled fruit from each replicate were evaluated for CRM damage. If & one third of the fruit surface area had CRM damage it was downgraded to process or juice fruit. The percent of downgraded fruit for each treatment was determined and expressed as percent russet.