Abstract
Abstract Celery was transplanted in a sandy loam soil on 15 Aug at the University of California's South Coast Field Station. The plants were sprinkler irrigated for 3 weeks and drip irrigated thereafter (water pH 7.2-7.5). Experimental plots were 3 beds wide (2 rows/bed on 40 inch centers) by 50 ft and separated with a 5 ft barrier with 4 replicates of each treatment in a randomized complete block design. Weekly application dates included 4, 11, 18, 25 Aug, 1, 9, 17, 23, 30 Oct and 6, 15 Nov applied using a tractor-mounted boom sprayer operated at 100 psi. As plant height and foliage density increased, nozzles varied from 1-3 per row and water increased from 40 gal/acre (4-18 Sep) to 50 gal/acre (25 Sep-1 Oct), to 100 gal/acre (9 Oct on). Disc-type cone nozzles incorporated D3 orifice disks, #23 or #25 cores and 50 mesh screens. The treatments (Baythroid, Pyrenone, Abamectin + sticker, Javelin and Trigard) received spreader-sticker (Leaf Act 80A). Leafminer populations were evaluated by weekly counts of leafminer prepupae and pupae in 4, 5V2 x 11 inch trays, when the plants reached a suitable height. Only the first 2 consecutive weeks data were included in the analyses, as leafminer populations were quite low for the following 4 weeks. The number of dead adult parasites of Liriomyza spp. were recorded in the same manner and on the same dates listed for pupal counts. Evaluation of Lepidoptera populations was based on no. of damaged plants found in 25 plants/100 replicate per 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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