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Home → Publications → Seed and Seedling Diseases in the Western US → Effects of Fumigaiton on Siol Pathogens and Beneficial Microorganisms

Effects of Fumigaiton on Siol Pathogens and Beneficial Microorganisms

Soil fumigation with broad-spectrum biocides is a non-selective means of killing soil-borne pathogens in forest seedling nurseries. Beneficial microorganisms (antagonists, competitors, pathogen parasites and mycorrhizal fungi) are also killed by most fumigants. Organisms are killed by direct contact with fumigants. Dormant structures of microorganisms are usually more resistant to fumigant action. Specific fumigants are more effective against certain microorganisms. Fumigant effects on populations of selected pathogens (Fusarium, Pythium, Phytophthora, Rhizoctonia, Macrophomina, and Phoma) and certain antagonistic fungi, bacteria, and mycorrhizal symbionts are discussed.


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Author(s): USDA Forest Service