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First Report of Powdery Mildew of Poison-Hemlock Caused by Erysiphe heraclei in North America

S. T. Koike and D. A. Glawe

March 2009


Poison-hemlock is a widely distributed biennial especially known for its toxic piperidine alkaloids that can poison livestock that eat this plant. In 2008, a powdery mildew was observed on poison-hemlock growing in coastal California. The causal agent was determined to be Erysiphe heraclei DC., previously unreported on this host in North America.


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