Apple, Evaluation of Several Sythetic Pyrethroid Insecticides for Control of Apple Pests, 1980

Four apple trees (one of each of the four cultivars, Triple Red Delicious, Yellow Delicious, Double Red Stayman and Commander Red York) were sprayed to the drip point for each treatment and the water control. All treatment trees were bordered on all sides by unsprayed buffer trees. Application was with an adjustable hand gun at 200 psi (14 kg/cm2). The pH of spray water was 7.4 in all cases. Treatments were applied on Apr 18, 24, May I, 12, 22, 28; Jun 4, II, 18, 25, Jul 2, 9, 16, 24; Aug 6 and 13. Pounce 3.2EC, 4 oz/100 gal (.31ml/litre) was applied up to and including Jun 4 on one treatment (4 trees). Commencing on Jun II at the manufacturer’s request, F.M.C. 45806 2.5ECat 2 oz/100 gal (l.56ml/litre) was substituted for Pounce. In determining the percent fruit injured by codling moth and plum curculio injuries per 50 fruit, from each of the four replicates, for each treatment were recorded if there were 50 apples present. Where there were less than 50 fruit, all were counted and the percentage injured recorded.