Table 1.

The most important pathogens currently affecting cannabis production indoors and management practices

Common name of disease	Pathogen(s)	Management options
Damping‐off	Botrytis cinerea Fusarium oxysporum Fusarium proliferatum Fusarium solani	Reduce ambient relative humidity, improve air circulation Apply biological control agents at rooting Removed diseased cuttings
Fusarium root and crown rot	Fusarium oxysporum Fusarium proliferatum Fusarium solani	Stock (mother) plants to be tested to ensure they are pathogen‐free Apply biological control agents at the vegetative stage of growth Avoid injury to roots and overwatering
Pythium root and crown rot	Pythium myriotylum Pythium dissotocum Pythium aphanidermatum	Avoid excessive watering Avoid injury to roots Apply biological control agents at rooting and vegetative stages of growth
Powdery mildew	Golovinomyces spp.	Vegetative cuttings should be disease‐free Irradiate leaves for 3–4 s with UV‐C light daily Apply weekly treatments of potassium bicarbonate Grow strains that are tolerant to infection Vaporize sulfur at night Remove and destroy diseased leaves
Bud rots	Botrytis cinerea Fusarium spp.	Reduce ambient humidity and moisture Avoid growing strains with large dense inflorescences that retain moisture Prune out diseased buds and destroy them
Post‐harvest molds	Botrytis cinerea Penicillium species	Maintain drying room conditions at optimal humidity and temperature Avoid damage to buds during harvesting and trimming Irradiate dried buds with gamma or electrobeam radiation
Dudding	Hop latent viroid	Stock plants to be tested to confirm they are pathogen‐free Remove and destroy infected plants