Potato Tubermoth and Green Peach Aphid Control on Potato Foliage, 1976

'Kennebec' potatoes were planted June 4, with a two-row commercial potato planter on 36 inch rows at Salinas, CA. Insecticides were applied August 3, and August 25, with a tractor drawn sprayer equipped with a four bed boom fitted with 15 Spraying Systems 8002 flat fan nozzles operated at 100 psi, delivering 60 gpa dilute spray. Plots were four beds wide by 75 feet long replicated four times in a randomized complete block design. Insect counts were taken from the center two rows of each plot selecting plants at random. August 19, sixteen days after the first application, all the foliage from four plants per plot were examined for treatment effects against tuberworm larvae. August 30, five days after the second application, green peach aphid apterae were counted by sampling 25 trifoliate leaflets per plot, selected from mid-plant height. Data were transformed to X + 0.5 and subjected to analysis of variance.