1-Corydalmine, an alkaloid isolated from roots of Corydalis ehaerophylla inhibited spore germination of some plant pathogenic as well as saprophytic fungi e.g. Alternaria brassicae, A. brassicieola, A. solani, Curvularia lunata, C. maculans, C. sp., C. pallseens, Erysiphe pisi, Fusarium udum, Helminthosporium species, H. penniseti and a Heterosporium species. 1-Corydalmine significantly inhibited spore germination of all the fungi at 100 to 1500 ppm. It was effective against all the fungi at 1500 ppm. C. lunata was highly sensitive to this chemical even at 250 ppm.