Anthracnose
Anthracnose (leaf blight) is a fungus that winters on twig tissue on the tree. In the spring, spores are transported to new buds and shoots. The disease is enhanced by
Phytophthora
Phytophthora is a genus of oomycetes that are similar to fungi. There are 59 species of Phytophthora, all of which cause disease in plants. Phytophthora ramorum is the species
Oak Wilt
Oak Wilt is a disease caused by the fungus Bretiziella fagacearum that is specific to oaks (Quercus spp.). The fungus is spread through root grafts between neighboring trees and by
Sudden Oak Death
Sudden oak death (SOD) is the common name for a fatal tree disease caused by Phytophthora ramorum, a species of oomycetes that are similar to fungi. SOD is one of
Whitefly
Whiteflies are tiny, pure white, moth-like sucking insects that prefer to feed and lay eggs on the undersides of leaves. Several species are known to infest trees, including ash whitefly,
Bronze Birch Borer
The Bronze Birch Borer is a wood boring beetle, common across the northern half of the United States, which attacks all birch species. The adult is a copper/bronze colored slender
Oak Worms
There are several caterpillars that feed on oaks including the California oak worm and tussock moth. Each of these caterpillars feed on oak leaves. Oak worms are smooth, small, yellow-green
Erythrina Gall Wasp
The Erythrina Gall Wasp is an exotic pest of the Wiliwili tree. Common tree names include tigers claw, Indian coral tree and Wiliwili-haole. It was first discovered in Hawaii in
Winter Moth
Winter Moth causes severe defoliation of hardwood trees. Winter Moth is appropriately named, as adult moths are generally active from November through January. The larvae begin feeding early
Goldspotted Oak Borer
The Goldspotted Oak Borer is a flat-headed borer that was originally found around the San Diego, California area. GSOB are currently known to attack three species of oak: coastal live,
