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Abstract
Medicinal plants play important roles in controlling plant diseases as one of the safest and ecofriendly methods. These plants have been used in the form of crude extracts as well as active principles in vitro and under field conditions to control plant diseases. Among the active principles, alkaloids have shown significant antifungal activity. We have investigated the effect of two alkaloids viz., (—)-corydalmine and (—)-isocorypalmine isolated from Corydalis chaerophylla, against spore germination of some plant pathogenic and saprophytic fungal spores. Significant inhibition of spore germination at 100 gugjml was seen against Curvularia penniseti, Curvularia sp. and Colletotrichum gloeosporioides by (—)-corydalmine but (—)-isocorypalmine was also effective against fungi included in the experiment.