Madrone: Collar rot (Phytophthora) Categories: Madrone Madrone Diseases Ornamental trees Ornamentals Last review date: 2026-08-07 12:13 Last edit date: Phytophthora collar rot on madrone Photo by: R.S. Byther Biology Collar rot is caused by a fungus which lives in soil. Leaves of infected trees may be discolored, stunted or may die. Cankers occur near the […]
Madrone: Leaf blight Categories: Madrone Madrone Diseases Ornamental trees Ornamentals Last review date: 2026-08-07 01:22 Last edit date: Leaf blight on madrone Photo by: G.A. Chastanger Biology Madrone trees suffer from numerous fungal leaf diseases. One such problem, madrone leaf blight, appears to be caused by a pathogen that damages leaves after periods of cold […]
Madrone: Leaf gall Categories: Madrone Madrone Diseases Ornamental trees Ornamentals Last review date: 2026-08-10 09:29 Last edit date: Madrone leaf gall (blisters) on leaves Photo by: R.S. Byther Biology Leaf gall in madrone is caused by a fungus that infects leaf tissue. From late spring to mid-summer, fruiting bodies emerge from the leaf tissue, rupture […]
Madrone: Leaf spot Categories: Madrone Madrone Diseases Ornamental trees Ornamentals Last review date: 2026-08-10 09:45 Last edit date: Madrone leaf spots Photo by: R.S. Byther Biology Madrone leaf spot is caused by a fungus that can overwinter on the leaves. More than 18 species of fungi have been reported to cause leaf spots on madrone. […]
Madrone: Madrone canker Categories: Madrone Madrone Diseases Ornamental trees Ornamentals Last review date: 2026-08-10 09:54 Last edit date: Black canker and peeling bark on madrone Photo by: R.S. Byther Biology Several different fungi can cause canker; they are spread by wind, rain, soil, tools, and equipment. They infect the tree at a wound and kill […]
Madrone: Madrone leafminer Categories: Madrone Madrone Insects Ornamental trees Ornamentals Last review date: 2026-08-11 12:48 Last edit date: Madrone leafminer and shieldbearer damage Photo by: S.J. Collman Biology Larvae of this leaf and twig mining moth blaze sinuous, serpentine mines across the upper sides of leaves. Since leafminer usually cause only minor damage, they do […]
Madrone: Shield bearer Categories: Madrone Madrone Insects Ornamental trees Ornamentals Last review date: 2026-08-11 12:55 Last edit date: Madrone leafminer and shieldbearer damage Photo by: S.J. Collman Biology Shield bearers are moth larvae that mine out elliptical pupal chambers on the leaves. When pupal cells drop off, “shotholes” or small “windows” are observed on the […]