Abstract
Abstract Experimental insecticides were evaluated for control of pear psylla in a five year old Bartlett pear block. Plots were arranged in a randomized block design with three replicates of three tree plots. Treatments were applied dilute to runoff with a handgun sprayer at 450 psi on May 29, and Juliy 11. Counts were made by sampling five spurs per plot and counting all pear psylla nymphs on each spur under a binocular scope. Pre-treatment counts were made May 27, and July 9, while post-treatment counts were made June 4 and July 15. Control was evaluated by calculating the percent reduction which occurred between pre-treatment and post-treatment counts for each material.
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