Dr. Phyto
alder Phytophthora root rot
Phytophthora alni
Symptoms
Sparse + chlorotic crown with small yellow leaves, dark sunken bleeding cankers at base of trunk (the diagnostic visible symptom), dark sap weeping from cankers (the eponymous tar spot), gradual crown dieback over 3-5 years, complete tree death typical along watercourses.
Treatment
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