APSnet Image of the Week

Phytophthora infestans, lemon-shaped sporangium of the potato late blight fungus.

Under cool, wet conditions, eight to ten zoospores are produced within the lemon-shaped sporangium.

Motile zoopores being released from a sporangium.

"And one to go!" A single zoospore remains in a lemon-shaped sporangium.

Zoospores beginning to germinate by producing a single germ tube.

Photographs courtesy Forrest W. Nutter, Jr.
Department of  Plant Pathology
Iowa State University, Ames 50011

APS publication number:  IW00009

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