Apple, Aphid Control, 1984

Test chemicals were applied on 1 Aug to 7-year-old apple trees at Monmouth, Maine, as dilute sprays, using a hand gun and a hydraulic sprayer operating at 250 psi and 300 gal/acre. There were 2 single-tree replications in a randomized complete block design. Prior to treatment, 5 succulent terminal shoots were tagged around the periphery of each tree at a height of 1 to 2 m. Evaluation was based on a count of all live aphids on the distal 4 unfurled and 1 furled leaves and on each terminal stem included by these leaves. Aug was a dry warm month, and the maximum daily temperatures for 5 days following treatment ranged from 85° to 90°F.