A5093725287- Yeasts and Rust Fungi Studies
- Plant Pathogens and Fungal Diseases
- Plant Pathogens and Resistance
- Forest Ecology and Biodiversity Studies
- Forest Insect Ecology and Management
- Plant and animal studies
- Plant Disease Resistance and Genetics
California Department of Food and Agriculture
2024-2025
The Marina strawberry tree (Arbutus × reyorum Demoly. ‘Marina’) is a popular ornamental species, prized for its glossy evergreen foliage, display of pink and white bell-shaped blooms, strawberry-like fruits. In April 2024, foliar sample from Humboldt County, California nursery, where P. ramorum had been detected earlier in the year, was submitted to CDFA Plant Pest Diagnostic Laboratory exhibiting symptoms marginal leaf necrosis (Fig. S1). A limited number symptomatic trees were located near...
Phytophthora is a long-established, well known and globally important genus of plant pathogens. Phylogenetic evidence has shown that the biologically distinct, obligate biotrophic downy mildews evolved from at least twice. Since, cladistically, this renders ‘paraphyletic’, it been proposed evolutionary clades be split into multiple genera (Runge et al. 2011; Crous 2021; Thines 2023; 2024). In letter, we review arguments for retention generic name with broad circumscription made by Brasier...
Wall. ex Roxb. (evergreen dogwood) is a bushy evergreen tree or shrub native to East Asia grown for its showy creamy bracts in late spring followed by attractive red fruit. In Feb 2023, sample of foliage with leaf spots and tip dieback from
Abstract We report observations of Onnia subtriquetra on bishop pine ( Pinus muricata ) and shore contorta var. from north coastal California. Our identification this fungus is supported by molecular information, morphological characteristics, a description the observed range West Coast. These represent an expansion geographic host ranges , which sites generally associated with declining tree condition presence other native forest pathogens insects.
More than 55% of U.S. lettuce (Lactuca sativa L.) production is in California, with Monterey Co. being the largest producer. Stunted mature romaine ‘Valencia’ and ‘Stomper’ iceberg ‘Frazier’ lettuces wilted outer leaves were collected from five commercial fields spring 2023 2024. Brown internal stem crown lesions progressed into sunken cavities plant collapse. Incidence was approximately 5 to 75%. Margins discolored tissue surface sterilized plated on PARP-CMA (Jeffers Martin 1986) colonies...