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Soil Substances Inducing Chlamydospore Formation by Fusarium. E. J. Ford, Department of Plant Pathology, University of California, Berkeley 94720; A. H. Gold(2), and W. C. Snyder(3). (2)(3)Department of Plant Pathology, University of California, Berkeley 94720. Phytopathology 60:124-128. Accepted for publication 20 August 1969. DOI: 10.1094/Phyto-60-124.

At least three, and possibly four substances in one Salinas Valley soil induced chlamydospore formation by one or more clones of Fusarium solani f. sp. phaseoli. The chlamydospore-inducing substances were separated by ion exchange and solvent precipitation techniques. Clones of the fungus responded differentially to each of the chlamydospore-inducing fractions isolated. Soil extracts made from soil samples collected at different times of the year varied independently in the capacity to induce three clones to form chlamydospores. The ability of clones of Fusarium to produce chlamydospores in a soil may be dependent on the presence of specific substances in that soil.