The effect of glyphosate on growth and reproduction of two pathogenic fungi of green peas was evaluated in laboratory studies. Liquid and agar media containing 0 to 50 mM glyphosate were inoculated with two isolates each of Fusarium solani f. sp. pisi and Pythium ultimum. Mycelial growth and spore production of the fungi were inhibited or stimulated by glyphosate, depending on concentration. Glyphosate did not affect pathogenicity of F. solani f. sp. pisi. The effect of glyphosate on pathogenicity of P. ultimum was not determined. Under field conditions, glyphosate probably would not affect pathogenicity or survival of either fungus.
