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May 2025Archived

 

Field picture submitted by Elizabeth Fichtner

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Igor's Urban Website!: Page

Goldenspotted Oak Borer (GSOB)

The goldspotted oak borer (Agrilus auroguttatus) is a flatheaded borer beetle that attacks oaks. It prefers read oak group, and mature trees, but has been found to attack other oaks and smaller trees.
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Igor's Urban Website!: Page

Foamy Bark Canker and Western Oak Bark Beetle (WOBB)

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.
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Igor's Urban Website!: Page

Sweet gum leaf scorch (Xylella)

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.
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Igor's Urban Website!: Page

Emerald Ash Borer (EAB)

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.
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Igor's Urban Website!: Page

Laurel Wilt

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.
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Igor's Urban Website!: Page

Asian Citrus Psyllid (ACP)

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.
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Igor's Urban Website!: Page

The History of Management of Mature Oak Woodland Stands in the Bay Area

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.
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Igor's Urban Website!: Page

Mature and Historic Tree Stands (MHTS) Toolkit

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).
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