Antifungal activity of l-azetidine-2-carboxylic acid isolated from Disporopsis aspera rhizomes against Podosphaera xanthii.

l-Aze was the main active ingredient of D. aspera against Podosphaera xanthii, which had both curative and eradicative effects. The results provided a strong possibility of using the crude extracts of D. aspera rhizomes and its main effective component, l-Aze as biocontrol agents to control cucurbits powdery mildew.