Oak: Leaf scorch categories: Oak Oak Diseases Ornamental trees Ornamentals revision date: 2022-11-25 12:20 Oak leaf with leaf scorch symptomsPhoto by: B.M. Johnson Biology Leaf scorch has many possible causes. Plants that are under stress (such as from drought or heat) may not provide sufficient water to leaves, causing the edges to turn bronze, then […]
Oak: Mistletoe categories: Oak Oak Diseases Ornamental trees Ornamentals revision date: 2022-11-25 12:16 Oak mistletoe (a true mistletoe)Photo by: J.W. Pscheidt Biology Mistletoe is a parasitic plant which grows on the branches of a host tree. True mistletoe, found on oaks and a few other hardwood species, does not grow on conifers. It is spread […]
Oak: Western oak looper categories: Oak Oak Insects Ornamental trees Ornamentals revision date: 2023-04-12 12:00 Looper crawling on edge of rhododendron leafPhoto by: S.J. Collman Biology The Western oak looper feeds mainly on the foliage of the Oregon white (or Garry) oak (Quercus garryana). Mature larvae of the Western oak looper are about 1″ long […]
Oak: Sudden oak death categories: Oak Oak Diseases Ornamental trees Ornamentals revision date: 2022-11-25 12:00 P. ramorum symptoms on tanoak leavesPhoto by: M. Elliott Biology Sudden oak death (SOD) is the common name for a disease of oaks (Quercus spp.) and tanoak (Lithocarpus densiflorus) caused by Phytophthora ramorum, a previously unknown and exotic plant pathogen. […]