Abstract Seven yr old lemon trees owned by Glen Curtis Inc. in Yuma, AZ were treated with insecticides for control of citrus thrips. The test was a RCB design consisting of four replicates. Each plot (30 ft by 90 ft) consisted of three trees in a row spaced 30 ft apart. Applications were made using a backpack air-blast sprayer calibrated to deliver 100 gpa. Applications were initiated approximately seven d after petal fall. All treatment applications included Kinetic spreader-sticker at 0.1% v/v. Treatments were applied on Mar 31, May 6 and May 21. Evaluations were made on Apr 4, Apr 7, Apr 14, Apr 21, Apr 28, May 5, May 8, May 12, May 19, May 23 and May 30. Percent infested fruit were estimated by sampling ten fruit per tree for the presence or absence of immature CT. Fruit damage was estimated on Jul 18 by rating the degree of scarring on the rind. Scarring was rated as 1 = no scarring, 2 = slight scarring around the calyx, 3 = significant scarring around the calyx, 4 = slight scarring on the side of the fruit and 5 = major scarring on the side of the fruit. Percentage fruit infested with immature CT were transformed using a square-root transformation for analysis, percentage values are presented in the tables. Differences among treatments were separated using ANOVA and an F protected LSD.