Chinese Tallow trees (*Triadica sebifera* L.) were introduced to the United States in the 1700's for its use in the soap industry (Stein and Flack 1996). It has since become an invasive species in the Southeastern US, displacing native species in …
Downy mildew is the most devastating disease threatening sustainable spinach production, particularly in the organic sector. The disease is caused by the biotrophic oomycete pathogen *Peronospora effusa*, and the disease results in yellow lesions …
*Peronospora effusa* is an obligate oomycete that causes downy mildew of spinach. Downy mildew threatens sustainable production of fresh market organic spinach in California, and routine fungicide sprays are often necessary for conventional …
*Erodium moschatum* (L.) L'Her., commonly known as whitestem filaree, is a winter annual weed that frequently occurs in many Mediterranean climates. *E. moschatum* has become naturalized in California since its introduction and grows wild in open, …
Pomegranates (*Punica granatum* L.) are an expanding industry in the United States with California growing approximately 32,000 acres with a crop value of over $155 million (1). During June and July of 2012, we observed severe limb and branch dieback …
California produces 26% of the United States pear crop on approximately 5,600 ha. A survey of seven northern California pear orchards (Pyrus communis cv. Bartlett) in summer 2010 revealed the presence of wedge-shaped cankers on 2- to 5-cm diameter …
Grapevine powdery mildew, caused by the ascomycete *Erysiphe necator*, is a major threat to grapes worldwide. Despite its global impact on grape production, *E. necator* is sensitive to adverse environmental conditions, such as excess heat, free …