Efficacy of Soil Fumigants and Methods of Application for Controlling Southern Blight of Tomatoes Grown for Transplants

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Abstract
Thirteen treatments involving 6 general purpose fumigants applied by different methods were evaluated for control of southern blight of field-grown tomato [Lycopersicon esculentum] transplants caused by Sclerotium rolfsii. All chemicals significantly reduced disease incidence, but they varied greatly in effectiveness. Vapam was the most effective and gave better control when applied as a drench than when injected or incorporated into the soil. Chloropicrin (Picfume, injected), methyl bromide (MC-2), and Terr-O-Gel (injected under polyethylene) were moderately effective in reducing disease incidence. Vorlex (water-soluble formulation) significantly reduced southern blight incidence but gave poorer control than most of the other chemicals regardless of the method of application. Terr-O-Gel and Terr-O-Cide injected into the soil also were less effective than most other treatments.

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