Abstract Experimental sprays were applied to replicated 6-15 tree plots in a block of'Bartlett' (82%), 'Bosc' (9%), D'Anjou' (7%), and 'El Dorado' (2%) pears. Trees were planted to a spacing of 24 × 24 ft. and were 13-yrs-old. Each treatment was replicated 4 times. All treatments were applied dilute to run off with a handgun from a truck mounted hydraulic sprayer at 400 psi. An average of 2.5 gal was applied per tree at 190 GPA. Refer to the tables for application dates. All plots received a regular fungicide maintenance schedule of Benlate, Streptomycin, Ziram, and Topsin-M. All sampling was conducted on a center 'Bartlett' tree in each replicate. Evaluation of treatments containing Sun 6 E Oil and Asana was made from 7 Mar to 10 Apr by counting psylla eggs on samples of 4 twigs from each replicate. On 24 Apr these treatments were evaluated by counting eggs and nymphs from samples of 5 spur leaves per tree. Thereafter, all treatments were evaluated by counting eggs and/or nymphs from leaf samples at 4°14 day intervals. Counts were made on 15 spur leaf samples from 1-28 May, on 8 spur and 7 third most distal leaf samples from 31 May to 14 Jun, and on 15 third most distal leaf samples from 21 Jun to 12 Jul. Russet ratings are based on 30 'Bartlett' pears/replicate, 120/treatment. Fruits were rated as 0 (no russet), 1 (raised lenticels), 2 (1-10% russeted surface), 3 (11-25% russeted surface), 4 (26-50% russeted surface), or 5 (>51% russeted surface). Possible ranges were 0-30 (none to raised lenticels), 31-60 (raised lenticels to 1-10% russeted surface), 61-90 (1-10% to 11-25% russeted surface), 91-120 (11-25% to 26-50% russeted surface), and 121-150 (26-50% to >51% russeted surface).