Apple, Rosy Apple Aphid Insecticide Test, 1980

The Insecticides were applied by 2 methods. The first method utilized a John Bean high pressure sprayer equipped with a 35 gpm pump and the trees were sprayed to run-off with each tree receiving approximately 7 gallons of water. The second method utilized a Friend Airmaster 393 airblast sprayer which was calibrated to deliver 50 gallons/acre (full spray) of water driven at 2mph. Refer to the table for the method and time of applications. Each treatment was applied to a 2-tree plot in a randomized block design with each plot consisting of a Rome Beauty and Stayman tree. Each treatment was replicated 3 times. Effectiveness of the materials on the rosy apple aphid was evaluated by examining the entire tree and determining the number of infested clusters, the number of infested leaves, and the number of Injured apples/tree. A leaf or cluster was considered infested if it contained one or more live aphlds.