Abstract

Abstract During the seasonal cover spray program at the U. W. Horticulture orchard, Arlington, Wl, dilute sprays were applied to apple trees in plots of 10 trees each. Sprays were delivered at 200 psi from a 100 gal Bean sprayer using a no. 2 gunjet (2 gpm). Insecticides were applied at petal fall (June 4) and covers (June 10, 26; July 13, 24; August 11, 24). Sumithion was omitted in the third cover (July 13). At North Leeds, Wl, acaricide treatments were applied to Red Delicious trees in single tree plots mid-July and early August. Dilute spray was delivered to trees at 150 psi (2 gpm) by hand gun until run off using a 15 gal Bean sprayer.

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