Effects of Application Methods and Plastic Covers on Distribution of cis- and trans-1,3-Dichloropropene and Chloropicrin in the Root Zone and Control of Nematodes and Fungi. (5300)
Authors:
L.T. Ou - University of Florida J.E. Thomas - University of Florida L.H. Allen* - USDA-ARS, Gainesville, FL L.A. McCormack - University of Florida J.C.V. Vu - USDA-ARS, Gainesville, FL D.W. Dickson - University of Florida
Abstract:
With the phase-out of methyl bromide scheduled for 2005, alternative soil fumigants must be adapted and new application methods investigated. Effects of three application methods (shank injection, Yetter coulter injection, and drip tube) and two plastic bed covers [virtually impermeable film (VIF) and polyethylene film (PE)] on distributions of cis- and trans-1,3-dichloropropene (1,3-D) and chloropicrin (CP) in the rooting zone of Florida sandy soil were studied. Commercial Telone C35 and Telone In-Line were used for injection and drip application, respectively. Regardless of method, beds covered with VIF retained more 1,3-D and CP for longer times than PE. Coulter injection promoted better retention of each chemical than shank injection, especially with VIF. Distributions of chemicals in drip-applied beds were less predictable. Control of root-knot nematode in tomato was good in VIF covered beds applied by coulter or drip tape. Thirty-one days after fumigation, total fungal populations in treated plots were not statistically different, perhaps due to stimulation from tomato root exudates.
Effectiveness of VIF for retaining fumigants in bedded rows was reconfirmed in this study.
Speaker Information: Leon Allen, USDA-ARS, Gainesville, FL, USDA-ARS, Agronomy Dept. PO Box 110965 University of Florida, Gainesville, FL 32611-0965; Phone: 352-392-8194; E-mail:
Session Information: Monday, November 1, 2004, 4:30 PM-6:00 PM Presentation Start: 4:30 PM (Poster Board Number: 2611)
Keywords: Methyl bromide alternatives; Virtually impermeable film; Soil fumigation; Nematodes and root pests