Powdery mildew: Disease can be caused by Golovinomyces ambrosiae, G. cichoracearum,G. spadiceous, andPodosphaera macularis. Powdery white fungal growth develops on upper leaf surfaces and on succulent tissue. More common in greenhouse production; can occur in fields in mild and temperate climates, often in the inner plant canopy. Podosphaera macularis is known to cross infect from hops from adjacent fields. Golovinomyces spp. affecting cannabis have broad host ranges, including agronomic crops, ornamentals, and weeds and are easily misidentified or confused with one another.
