Disease management approaches for Cannabis sativa L.

Cannabis (Cannabis sativa L.) plants are affected by many pathogens, including Golovinomyces spp., Fusarium oxysporum and Pythium spp. which cause severe losses to producers. Currently, there are a limited number of commercially available products to manage these diseases but data about their comparative efficacy is lacking. Therefore, the efficacy of various management options for these diseases was tested. The most effective treatments that significantly (P < 0.05) reduced powdery mildew were Luna Privilege SC (fluopyram), Regalia® Maxx, MilStop®, Rhapsody ASOTM, neem oil, and Stargus®. Daily exposure of plants to UV-C light significantly reduced disease (by 45.2%). The most effective treatments for F. oxysporum management were Lalstop, Rootshield, Asperello and Stargus, which provided a significant reduction (30 to 56.3%) in mean disease severity 14 days post-inoculation. Lalstop and Rootshield were also effective at significantly reducing P. myriotylum.