A comparison of tomato bacterial spot resistance for various round tomato spotted wilt resistant cultivars, 2008

摘要

The trial was conducted in a Bojac fine sandy loam soil (organic matter < 1%) at Virginia Tech’s Eastern Shore Agricultural Research & Extension Center in Painter, VA. Fertilizer was applied at the rate of 75 lb/A N, broadcast incorporated before beds were formed on 18 Apr. This is equivalent to 150 lb/A nitrogen after bed formation. Beds were fumigated with 100% chloropicrin at rate of 300 lb/A, covered with reflective plastic mulch equipped with trickle irrigation tubing on 18 Apr. Insect and weedcontrol was accomplished using recommended practices. Tomato transplants were irrigated as needed throughout the course of the study. Plots consisted of single, 20-ft rows spaced 6-ft apart. Greenhouseproduced tomato transplants for each cultivar were hand transplanted at a spacing of 18 in apart within the row on 6 Jun. Cultivars were arranged in a randomized complete block design with four replications per treatment. Tomato transplants werestaked and strung according to commercial practices on the Eastern Shore of Virginia. The initial purpose of this trial was to evaluate the tomato spotted wilt virus (TSWV) resistance of these cultivars; however, TSWV did not develop in this trial. Dueto heavy rainfall and persistent dews, bacterial spot developed in the research area. Foliar assessments of bacterial spot (incidence and severity) were conducted on 16 Jul. Mature green fruit were harvested on 4 and 19 Aug. Harvested fruit wereassessed for bacterial spot infection and percentage of fruit, by weight, was determined. Fruit were sized according to commercial guidelines (Small, Medium, Large and Jumbo) and total yields were recorded. Marketable yield was determinedby subtracting the weight of fruit infected by bacterial spot from the total yield.