Table 1.
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 |