| Disease or Pest Name | Description of Disease or Pest |
|
Oak root fungus
Armillaria mellea |
Armillaria cases reduced terminal growth and general decline in affected plants, As the Armillaria advanc... |
|
Phytophthora root disease
Phytophthora cinnamomi |
P. cinnamomi causes a general plant decline. Plants can be killed quickly causing them to retain dead le... |
|
Powdery Mildew
Microsphaera alni |
Powdery mildew may occur on any green plant tissue or on flowers and fruits. Light colored mats of funga... |
|
Sooty Mold
Phaeosaccardinula dermatia |
Sooty mold is indicated by black or dark, resinous, hyphal growth on upper and lower leaf, fruit, twig, a... |
|
Sudden Oak Death
Phytophthora ramorum |
Phytophthora ramorum causes two types of symptoms on affected plants. In some it causes bleeding cankers... |
|
True Mistletoe
Phoradendron villosum |
True mistletoe is an evergreen parasitic plant with developed stems and leaves. The infection causes swo... |
|
California oakworm
Phryganidia californica |
California oakworm is an important defoliating pest of ornamental coast live oak. Most years it is of li... |
|
Carpenterworm
Prionoxystus robiniae |
The carpenterworm attacks small and large trees in the trunk or limbs. It prefers open grown trees. Th... |
|
Fruittree leafroller
Archips argyrospila |
"Fruittree leafroller can be a serious pest throughout California. It occurs on a very large number of or... |
|
Gall wasp
Hymenoptera:Cynipidae |
Hundreds of species of gall wasps occur in the oaks in California. The female wasp deposits her egg in t... |
|
Gold-spotted Oak Borer
Agrilus coxalis |
Agrilus coxalis is killing oak trees by the thousands in Southern California, according to a report by th... |
|
Oak pit scales
Aesterolecanium minus |
Oak pit scales feed on oak twigs causing ring-shaped depressions on the bark. Death of twigs and distort... |
