Apple, Apple Aphid Control and Effect on Beneficials, 1977

The treatment area was divided into 2 blocks, A and B, consisting of spur and Top Red Delicious trees, respectively. The trees were 5-6 years old and .of uniform size. Various insecticide and miticide treatments were applied prior to the start of the aphid tests. These were: March 17 - Cyprex (1.12 kg/ha, Block A) and superior oil (37.415 litre/ha + Cyprex 1.12 kg/ha, Block B); March 25, 30 - Dikar (2.80 kg/ha, Block A) and superior oil (2.34 litres/ha + Benlate .28 kg/ha, Block B); April 6, 13 - Dikar (2.80 kg/ha, Block A) and superior oil (2.34 litres/ha + Benlate .28 kg/ha + Polyram 1.40 kg/ha, Block B). On April 20, the two blocks were put on different spray programs: Block A - Dikar (2.80 kg/ha + Zolone 1.12 kg/ha); Block B - Benlate (.28 kg/ha + Guthion .28 kg/ha). These materials were applied on April 20, 27 and on May 5, 12, 19 and 26. A pretreatment count of terminals infested with A. pomi was made on May 27. This was done by randomly selecting 200 branches per block; the terminal 20 cm of each branch was checked for apterous aphids; 80% infested in both blocks. Many predators were observed and recorded. Among these were: Deraceocorisnebulosus Uhler, Oriusinsidiosus Say, Stethoruspunctum LeConte, Leptothripsmali (Fitch), Leucopis sp., many species in the Syrphidae and Chrysopidae and a number of spiders. On May 28, the following materials were applied to different treatment plots in each block: Pirimor 50W (0.70 kg/ha), Pirimor 50W (0.35 kg/ha), Cygon 43.5EC (0.12 litres/ha), Cygon 43.5EC (0.06 litres/ha), Phosphamidon 8EC (0.60 litres/ha). The plots consisted of 6 trees each, with 6 plots in the same row. Treatment rows were spaced with a buffer row between them. Each treatment was replicated 4 times, twice in each block.