Bear Oak
Quercus ilicifolia
Fagaceae · broadleaf deciduous tree · introduced
Last updated
Quick Facts
Height
25 ft
Light
Full Sun
Hardiness
Zone Zones 5a–8b
Origin
northeastern U
Watch for this season
Primary Spore Release
Cytospora CankerHigh
Spring Canker Activation
Leaf BlisterHigh
Spring Spore Germination and Infection
Nectria CankerHigh
Spore Release (Fall & Spring Rains)
+ 4 more — see full disease and pest lists below
Diseases: Regionally Documented (13)
Ramorum Blight (Sudden Oak Death) Mistletoe Armillaria spp. — primarily A Armillaria Root Rot Discula destructiva (dogwood), Kabatiella and Discula spp... Anthracnose Cytospora spp. (Valsa spp., Leucostoma spp.) Cytospora Canker Microstroma album Frosty Mildew Ganoderma applanatum Ganoderma Root and Butt Rot Pseudoinonotus dryadeus Inonotus Root and Butt Rot Taphrina spp. Leaf Blister Phoradendron villosum Mistletoe (a True Mistletoe) Neonectria ditissima Nectria Canker Multiple obligate biotrophic fungi (Erysiphales: Erysipha... Powdery Mildew Inonotus dryophilus White Pocket Rot (Piped Rot)
Pests: Regionally Documented (14)
Looper Stem Gall Asterolecanium spp. Pit scale Platycotis vittata Oak Treehoppers Bucculatrix albertiella Oak Ribbed Casemaker Phylloxera spp. Oak leaf phylloxera Various (Cynipidae, Cecidomyiidae, Eriophyidae, Psyllidae) Leaf galls Neuroterus saltatorius Jumping Oak Gall Andricus quercuscalifornicus California Gallfly Prionoxystus robiniae Carpenterworm Oak gall wasp Bucculatrix ainsliella Oak skeletonizer Edwardsiana rosae Rose leafhopper Various (Cynipidae, Cecidomyiidae, Eriophyidae) Leaf and twig gall
Data Maturity Structured Multiple sources. Expert review underway.