Abstract
Eight year old lemon trees in Yuma, AZ, were treated with experimental insecticides for control of citrus thrips. The treatments were arranged in a RCB design, consisting of four replicates. Each plot (30 by 90 ft) consisted of three trees, spaced 30 ft apart, in a row. Applications were made using a backpack air-blast sprayer calibrated to deliver 100 gpa. Treatments were applied approximately seven days after petal fall on Apr 2, Apr 23 and May 08. Evaluations were made on 4 Apr, 9 Apr, 15 Apr, 23 Apr, 25 Apr, 29 Apr, 6 May, 10 May, 13 May, 20 May and 29 May. Percent infested fruit were estimated by sampling ten fruit per tree for the presence or absence of immature CT. Fruit damage was assessed on Aug 19 by rating the degree of rind scarring: 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. Percentages fruit infested with immature CT were statistically analysed using a square-root transformation, but the data presented in the tables is untransformed. Differences among treatments were separated using ANOVA and an F protected LSD.