Abstract
Abstract Celery was transplanted on 10 Aug at the Univ. of Calif. South Coast Field Station in Santa Ana, CA. The crop was sprinkle irrigated for 3 wk and drip irrigated thereafter. Experimental plots were 3 beds wide (40-inch centers) by 50 ft long with 1 untreated buffer row between plots. Each bed contained 2 rows of plants 6-8 inches apart. Treatments were replicated 4 times in a randomized complete block design. Insecticides were applied weekly with a tractor-mounted boom sprayer from 25 Aug through 10 Nov, except on 29 Sept when rain precluded treatment. As plant height and foliage density increased, nozzles varied from 1-3 per row and carrier (H2O) increased from 50-100 gal/acre. Hollow cone nozzles incorporated D3 orifice disks, #25 cores, and 50-mesh screens. All treatments except Avermectin included 0.04% spreader-sticker (Leaf Act 40). Evaluation of beet armyworm and black cutworm damage was based on the number of damaged plants found in 10 randomly selected plants/replicate (80/ treatment) from the center 2 rows of each replicate at harvest. When plants reached a suitable height, 4 inches X 8 inches pupal trays were inserted between rows and the no. of leafminer larvae, puparia, and pupae and leafminer parasites collected in trays were counted on 11, 18, 26 Oct and 1 and 8 Nov. Four trays were counted in each replicate.
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