Control of Biomodal First Flight Codling Moth in Walnuts, 1992

Abstract

Abstract The trial was conducted on ‘Serr’ walnuts in a commercial orchard near Arbuckle, Calif. Five treatments were replicated 3 times in a randomized complete block design. Each replicate consisted of 8 rows by 8 trees planted on a 30 ft. by 30 ft. spacing (1.32 acres). Treatments were applied with an air blast sprayer operating at 1.7 mph and delivering 50 gal/acre of finished spray. The first application was applied on 27 Apr, at the end of the first peak of the first CM flight (368 degree days [DD]). The second application was applied on 19 May, at the end of the second peak of the first CM flight (817 DD). Control of the first peak was evaluated by counting all CM-infested dropped nuts from 4 trees in the center or each plot weekly from 19 May through 16 Jun. Control of the second peak was evaluated by determining the percent CM infestation from 200 nut pairs from the bottom V4 of the 4 trees in the center of each plot on 16 Jun. Walnut aphids were monitored by inspecting 10 leaflets/tree from the 4 trees in the center of each plot weekly from 2 Jun through 16 Jun.