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Proceedings of Past Forest Nursery Association Meetings:

Effects of Fumigation on Soil Pathogens and Beneficial Microorganisms
James, R.L.
1989: Bismark, ND
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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