Pacific Madrone (Arbutus menziesii)
Root and Ground-level Symptoms
Crown and Needle Symptoms
|
Symptom |
Possible Causes |
Reference Photo |
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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) |
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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) |