Abstract
Abstract A RCB design was used in a commercial greenhouse (Santa Barbara, CA) with 3 blocks of ‘Royalty’ rose beds for each treatment. Treatments were applied in one house to 12-45 x . 9 m beds; controls were unsprayed. Four weekly applications of the material were made beginning 6 Aug using a mobile 757 liter Bean sprayer at 250 psi, with delivery through a 3-pronged, high pressure multiple spray nozzle. Weekly samples were taken at random from each bed on 6, 10, 17, 24, and 31 Aug. The samples consisted of 10 blooms per treatment bed placed in 50% ethanol. All stages of thrips were extracted I from the ethanol under suction and larvae and adults were counted using a dissecting microscope. Data were analyzed using ANOVA and treatment means I were separated using Student-Newman-Keuls’ procedure (P ≤ 0.05).
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