Pear, Pear Psylla Control, 1977

A three-year-old pear block was divided into eight tree plots replicated three times in a randomized complete block design. The Morestan treatment was first applied at the white bud stage April 19. The two Ambush treatments were applied June 9 but 2.2 in. of rain fell before these treatments dried. All seven treatments were applied or reapplied on June 13. Treatments were applied dilute to runoff with high pressure handgun sprayer at 425 psi using ca 1.2 gal per tree (225 gal/acre). Treatments were evaluated by sampling four spurs per plot and counting all pear psylla nymphs and eggs on each spur under a binocular scope in the laboratory. The pre-treatment count on June 8 indicated a good 2nd brood nymphal population was present. Post-treatment counts were made June 17 and July 11.