Abstract
Alternaria sp., Colletotrichumdematium var. truncatum, Macrophomina phaseolina and Phomopsis sp., isolated from soybean ( Glycine max ) seeds, differed in tolerance to paraquat as measured by mycelial production, linear mycelial growth, spore germination and glucose consumption. Alternaria sp. was most sensitive to paraquat; Phomopsis sp. least sensitive with M. phaseolina being intermediate. The growth of C. dematium var. truncatum was variable. Colonization by M. phaseolina and Phomopsis sp. of soybean stem pieces treated with different concentrations of paraquat and then surface sterilized, was inhibited and stimulated, respectively. Paraquattreated soybean pods released electrolytes and amino acids. These results are discussed in relation to the occurrence of C. dematium var. truncatum and Phomopsis sp. on soybeans sprayed with paraquat in the field and the use of paraquat in the laboratory for the detection of latent colonization by these and other fungi.
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