Root and Ground-level Symptoms
Crown and Needle Symptoms
Symptom | Possible Causes | Reference Photo |
Grey to brown spots on leaves | Madrone Leaf Blight (Mycosphaerellaarbuticola) or other leaf pathogen |
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Silk webs covering branch tips and expanding inward | Fall Webworm (Hyphantria cunea) | |
Wilting and defoliation on leaves of young trees | Phytophthora Root Rot (Phytophthora cactorum) |
Trunk and Branch Symptoms
Symptom | Possible Causes | Reference Photo |
Large, slow-growing cankers on trunk with raised edges around them AND/OR Fast-growing canker swirling around tree | Arbutus Canker (Neofusicoccum arbuti) |
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Cankers start on branches and spread towards the the bole | Madrone Canker (Fusicoccum aesculi) |