Cause The fungus, Sclerotinia sclerotiorum, has been reported on chervil shade-house production in California. This fungus is a cosmopolitan fungus that occurs across the globe, infecting a very large number of plant species including chervil.
Cause The fungus, Erysiphe heraclei, was reported on chervil production in California. Testing by University of California Cooperative Extension showed that strains of E. heraclei from chervil didnot infect either celery or parsley. Cleistothecia were not observed.
Cause Pythium spp. and Fusarium spp. can cause root rot and seedling blight known as damping-off. These soilborne fungi and fungus-like microorganisms can persist indefinitely in soil or plant debris. Pythium is favored by wet soils.
Cause Golovinomyces depressus has been reported from Idaho and observed many times in western Oregon on Centaurea montana. These are highly specialized pathogens that form a close association with the host. Conditions that favor the host also tend to favor the pathogen. Overcrowding of plants is also favorable for disease development.
Powdery mildew can be heavily on Centaurea montana.
Jay W. Pscheidt, 2018.
Cause There are 8 different species of Puccinia reported from the PNW on Carex sedges. Sedges are the telial host while the alternate host is variable and dependent on the rust species. Uromyces perigynius is another rust reported from Oregon and Washington.
Rust has been a problem in nursery production of some Carex species.
Cause Numerous species of fungi, including Alternaria, Fusarium, and Helminthosporium spp. They infect kernels during seed maturation, especially green kernels, and are favored by high relative humidity or rainfall. Some fungi can be pathogenic on seedlings that develop from infested seed.
Cause The fungus, Fusariumoxysporum f. sp. medicaginis, is a vascular fungus that can survive in soil indefinitely as durable spores (chlamydospores) or in association with plant debris. Seed can also transmit Fusarium wilt, usually by contamination of the seed coat.
