Drought is decreasing but not defeating the pathogen that causes sudden oak death, according to a citizen science-assisted survey conducted this spring by a UC Agriculture and Natural Resources forest pathologist.
Results of the 2015 Sudden Oak Death Blitz survey reveal coastal mountain infestations in areas such as Big Sur (19% infection), the Santa Cruz Mountains (13% infection), and western Sonoma County (12% infection) remain high despite an overall decline in infection rates from 4.4% to 3.7% across California's 15 infested counties.
Sudden oak death (SOD) symptoms have been seen in Alameda, Contra Costa, Humboldt, Lake, Marin, Mendocino, Monterey, Napa, San Francisco, San Mateo, Santa Clara, Santa Cruz, Solano,...
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- Author: Akif Eskalen
[From the August 2015 issue of the UC IPM Green Bulletin]
Declining coast live oak (Quercus agrifolia) trees have recently been found throughout urban landscapes in Los Angeles, Orange, Riverside, Santa Barbara, Ventura and Monterey counties. A fungus associated with a specific beetle is causing the decline by spreading what is known as “foamy bark canker disease” (Figures 1 and 2).
The fungal species, Geosmithia pallida, was recovered from symptomatic plant tissues in association with the western oak bark beetle.../span>
The summer is winding down, but many warm-weather pests, like whiteflies are still going strong. Whiteflies are tiny white insects commonly found in vegetable garden and landscape plantings in large numbers. Often they fly around plants when disturbed, which is when people first notice them.
Despite their name, whiteflies are not true flies but are actually related to aphids, scales and mealybugs. Like these insects, whiteflies cause damage when they suck plant juices from leaves, which yellow or die off. Whiteflies excrete excess liquid called honeydew that is sticky, and may be covered with black sooty mold. The honeydew also attracts ants, which disrupt naturally-occurring
- Author: Anne Schellman
This summer, the media frequently reported an increase in the density of pests in the home and landscape. The drought has been cited as the cause of these problems. Pest control companies quoted in articles confirm that the demand for their services is much higher this year than in years past.
Many people are asking, “Why are there so many more pests this year than usual?” According to Dr. Andrew Sutherland, the urban Integrated Pest Management Advisor for the San Francisco Bay Area, we are asking the wrong question. “The overall abundance of pests probably hasn't changed and may even have decreased as compared to wet years. The real questions we should be asking are ‘Why are these pests appearing earlier...