New pests threaten our native trees

Typical Southern California oak woodlands

Oaks are emblematic to the California landscape. An important source of food for past Californians, we still come to these trees today for shelter, shade, and beauty, in addition to the values they provide as wildlife habitat. Oak woodlands cover more than 7 million acres, and oaks provide refuges in parks, backyards, and along streets in urban and suburban areas. But oaks in Southern California are faced with several serious threats, including changing land uses, fire, and insects and diseases.

Gold-spotted Oak Borer

New and old pest species are affecting these iconic trees. New threats include the Goldspotted Oak Borer and the Polyphagous Shot Hole Borer, and woodlands in the northern part of the state have been devastated by Sudden Oak Death.

Report a Pest

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New Oak Threats Video

Informacion en Espanol

Alerta de plaga: Marchitez de fusarium, vectorado en Árboles de
aguacate en California por el Polyphagous Shot Hole Borer