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The Western Oak Bark Beetle (WOBB) is a small (2mm long) beetle that spreads a fungus (Geosmithia pallida) when it bores into oak trees. Wet discoloration can be observed from the beetle entry holes, including foamy liquid down tree trunks.
A bacterium known as Xylella (species: Xyella fastidiosa) is spread by piercing and sucking insects such as leafhoppers and spittle bugs, but most commonly sharpshooters.
This small (0.39-0.51 inch, 10-13mm), metallic green boring beetle (Agrilus planipennis) serious damage to Ash trees. Beetle larvae develop under the bark as they feed on the tree. Initial attacks cause yellowing and thinning of foliage.
The redbay ambrosia beetle (Xyleborus glabratus) bore into trees of the laurel family, such as redbay, sassafras, pondspice, bay laurel, and avocado. These beetles spread a fungus (Raffaelea lauricola), causing Laurel Wilt.
The Asian citrus Psyllid (Diaphorina citri) is a piercing-sucking insect that feeds on new leaf growth of citrus plants and closely related plants of the Rutaceae family (such as box orange, Indian curry leaf, orange jasmine, calamondin). The feeding can caused twisted or notched leaves.
The urban-wildland interface zone in parts of the San Francisco Bay Area supports mature oak woodlands that are dominated by either Coast live oak (Quercus agrifolia) or Oregon oak (Quercus garryana). These oak woodlands provide habitats for a number of wildlife and understory plant species.
This toolkit synthesizes the current state of knowledge regarding the preservation and management of mature and historic trees - both in urban settings, and trees located at the urban-wildlife interface (WUI).
Californias forests comprise of a beautiful tapestry of landscapes and ecosystems that are home to a variety of native and non-native plants and wildlife, some of which are endemic to California or even to a smaller geographic scale.
