First report of Pythium ultimum causing crown rot in greenhouse grown Cannabis sativa (L.) in California

• Published in: Plant disease
• Main Authors: Pitman, Tera L, Philbrook, Richard N, Vetterli, Maxwell R, Warren, Jeremy G
• Format: Journal Article
• Language: English
• Published: United States 01.04.2021
• Subjects: Oomycetes; Pathogen detection; Cannabis sativa; Pythium ultimum; Causal Agent; Subject Areas

In April of 2020 cuttings of (L.) in a greenhouse in San Mateo County, CA were observed collapsing, and further observation revealed: water-soaked stems, tan discoloration to the cortex, and discolored roots. The greenhouse irrigation system was supplied by a local stream. We collected one-liter wat...