Hemp (Cannabis sativa) is grown both outdoors and in greenhouses.  Outdoor-grown hemp is susceptible to infection by leaf spot fungi that affect other crops and nearby plants, especially during periods of extensive rain or high humidity.  There are three primary…

Problem During the last 2 weeks of July, several hemp samples were received and evaluated by specialists at the University of Kentucky (Lexington and Princeton).  Hemp russet mites (Aculops cannabicola, Acari: Eriophyidae) (Figure 1) were observed on nearly all of…

Powdery mildew can affect numerous plants, including fruit, vegetable, and agronomic crops, as well as woody and herbaceous ornamentals. Kentucky hemp is also susceptible to this disease. Plants infected early in the season can be seriously damaged, while those affected…

In 2018, there were significant increases in confirmed cases of southern blight in hemp.  The fungal disease affects a wide range of plant species, as well as hemp. When stems and roots become infected, plants can wilt, decline, and/or die,…

Diseases are a major concern for greenhouse hemp growers, and they can be a factor that limits the profitable production of plants. The warm, humid greenhouse environment provides optimal conditions for reproduction of many pathogens. A good sanitation program can…

Hemp is often considered a disease-free plant. However, research is being done to determine whether certain pathogens can increase to problematic levels in the field. Should disease become a significant problem in field-planted hemp, the result can be premature leaf…