Apple, Apple Aphid Control, 1978

Test materials were applied to 8-yr-old apple trees on July 12 at Monmouth, Maine, as dilute sprays with a hand gun from a hydraulic sprayer operating at 300 psi and at a rate of ca. 200 gal/acre. The fungicide cover program during the course of this experiment consisted of Polyram 80W (2 lb/100 gal) which was sprayed on the trees on July 21. There were no tank-mixtures of insecticides with Pol yram. There were 2 single-tree replications per treatment. A randomized, complete-block design was utilized with 2 Red Delicious cultivars per treatment. Prior to treatment, 10 succulent terminal vegetative shoots (5 with high aphid counts and 5 with low counts) were tagged around the periphery of each tree at a height of 3 to 6 ft. Evaluation was based on a count of all live aphids found on the distal 4 unfurled and 1 furled leaves and on the stem including by these leaves on each tagged terminal shoot. Aphid population pressure was not severe.