Evaluation of Organic Fungicides for Control of Hemp Powdery Mildew, Geneva, NY, 2025 (2025)

Powdery mildew, caused by the fungus Golovinomyces ambrosiae, is a common disease of greenhouse-grown hemp ( Cannabis sativa L.). Symptoms include white, powdery patches on the adaxial leaf surface that spread to other plant tissues including stems and inflorescences, impacting the plant's photosynt