Evaluation of fungicides to control anthracnose fruit rot in annual strawberry, 2007-08.

摘要

On 15 Oct 07, bare-root runner plants from Canada were transplanted into methyl bromide:chloropicrin (98:2) fumigated soil in plastic-mulched, raised beds. The beds were 28-in. wide on 4-ft centers. Each bed contained two staggered rows of plants spaced 15-in. apart within rows and 12-in. between rows. Treatments were arranged in a randomized complete block design with four blocks, each in a separate bed. Individual 12-plant plots were 8.1-ft long, separated by 3.7 ft gaps within beds and an unplanted bed between blocks. Transplants were irrigated by overhead sprinklers for 10 days to aid establishment, then irrigated and fertilized through drip tape. Fungicide applications weremade weekly from 20 Dec to 12 Mar (13 applications) using a CO2 backpack sprayer calibrated to deliver 100 gal/A at 40 psi through two hollow-cone nozzles, 12 in. apart on the boom. Experimental products were applied throughout the season in some treatments and late in the season in others. Late season treatments were preceded by maintenance applications of captan at a low rate (1.5 lb/A) during the early season. Fruit were harvested twice weekly from 2 Jan through 14 Mar (22 harvests). Marketable fruitwere counted and weighed to determine yield. Small fruit weighing less than 10 g, diseased fruit, and other unmarketable fruit were also enumerated. Disease incidence was expressed as a percentage of the total number of marketable and unmarketable fruit. Experimental variables were analyzed by two-way ANOVA. Percentage data were transformed by an arc sine square root expression prior to the analysis. Non-transformed means are presented.