Phytophthora ramorum
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Phytophthora ramorum is the oomycete known to cause the disease sudden oak death. The disease kills oak and other species of trees and has had devastating effects on the oak populations in California
Sudden Oak Death
A hillside in Big Sur, California, devastated by sudden oak death
Umbellularia
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Umbellularia californica is a large hardwood tree native to coastal forests and the Sierra foothills of California, and extending into the coastal forests southwestern Oregon and the mountains of nort
Phytophthora ramorum
…forests were susceptible to P. ramorum. Vulnerable species include rhododendron, madrone (Arbutus menziesii), evergreen huckleberry (Vaccinium ovatum), California bay laurel (Umbellularia californica), buckeye (Aesculus californica), bigleaf maple (Acer macrophyllum), toyon (Heteromeles arbutifolia), manzanita (Arctostaphylos…
Umbellularia californica 02
Leaves
Flowers
Unripe bay nut