Apple, Insecticide Test, 1977

An experimental insecticide pydrin was compared with two rates of Guthion and Penncap M for the control of codling moths as well as for the harmful effects on a common predatory mite species, Typhlodromus arboreus. Sprays were applied to single tree plots in a randomized block design. Each treatment was replicated four times. Trees were thoroughly sprayed to the point of run-off using a powered, pull-tank type sprayer with a hand gun. Chemicals were applied at about 350 psi pressure and at a rate of 350-400 gallons/acre. The codling moth emergence was monitored using Zoecon’s pherocon traps and spray timing determined accordingly. The first spray was applied June 11, 1977 and repeated on July 14 and August 16. The effectiveness of various treatments against codling moth was determined by examining approximately 100 apples/plot at harvest. The harmful effect of these insecticides on the predatory mite population was determined by collecting 25 leaves/plot at weekly intervals and examining for the number of eggs and mobile mites.