Abstract
In Oregon, hemp (Cannabis sativa) production has increased substantially after cultivation was legalized in the 2014 and 2018 Farm Bills. Typically, hemp species are affected by powdery mildew caused by Golovinomyces species. This paper reports on hop powdery mildew caused by Podosphaera macularis, found colonizing hemp in natural conditions. The occurrence of the hop powdery mildew fungus on hemp may have management implications for both the hemp and hop industry.
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