Pear, Pear Pest Control, 1983

Abstract Twenty-yr-old Anjou pear trees were sprayed with handgund operating at 600 lb/in2 to evaluate candidate pesticides for control of pear psylla. Plots consisted of five single-tree replicates in randomized block design. Pear psylla densities were estaimated by counts of adults and nymphs at about 2-week intervals. Adults were counted on five beating-tray samples per rep. Nymphs were counted from 50-leaf samples per rep. Leaf samples consisted of proximal, distal and three evenly spaced leaves between from each of 10 terminal shoots. Leaves were brushed and resulting slides were examined under a dissecting microscope. Pear psylla honeydew russet was measured by examining 25-fruit samples at harvest. Damage was recorded according to US grade standards for winter pears. Firmness, soluble solid content and weight were also measured on the fruit.