Abstract
Abstract Celery was transplanted in a sandy loam soil on 4 Aug at the University of California’s South Coast Field Station. The plants were sprinkler irrigated for 3 wk and drip irrigated (water pH 7.2-7.5) thereafter. Experimental plots were 3 beds wide (2 rows/bed on 40-inch centers) by 50 ft and separated by a 5-ft buffer with 4 replicates of each treatment in a randomized complete block design. Application dates were 15, 22, and 29 Sep; 6, 16, 22, and 29 Oct; and 9 Nov. One Abamectin treatment was applied biweekly for 4 applications beginning 15 Sep. All chemicals were applied by a tractor-mounted boom sprayer operated at 100 psi. As plant height and foliage density increased, nozzles were varied from 1 to 3/row and the carrier (water) was increased from 50 gal/acre (15, 22, and 29 Sep) to 100 gal/acre (6 Oct). Disk-type cone nozzles incorporated D3 orifice disks, #23 or #25 cores, and 50-mesh screens. All treatments except Abamectin received spreader-sticker. An antifoaming agent (No-Foam) was used with all treatments. Leafminer populations were evaluated by weekly counts of leafminer prepupae and pupae in four 5½- by 11-inch trays/replicate when the plants reached a suitable height. Sampling dates were 14, 21, and 28 Sep; 5, 21, and 28 Oct; and 4 and 5 Nov. The number of dead adult parasites of Liriotnyza spp. were recorded in the same manner and on the same dates listed for pupal counts. Evaluation of Lepidoptera populations was based on number of damaged plants found in 25 plants/replicate (100/treatment) from the center 2 rows of each replicate at harvest (20 Nov). Beet armyworm and black cutworm damage were recorded separately.
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