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Evaluation of Insecticides Against Birch Aphid Nymphs on Birch, Wayne County, Ohio, 1985


 Japanese white birch (5.5 m tall) growing in an experimental birch planting at the Ohio State University Agricultural Research and Development Center near Wooster were chosen for evaluating efficacy of insecticides against newly hatched birch aphid nymphs. A CO2 compression sprayer at 40 psi with a single Teejet SS8004 flat-fan nozzle was used to apply 300 ml of finished material to an infested branch of 4 single-tree replicates/treatment. Application was made 12 Apr under sunny skies at 18°C and a breeze of 8-16 km/h. Treatment effectiveness was evaluated 15 Apr by counting the number of live nymphs on 12.5-cm sections of 3 terminal twigs from each replicate tree.