This is an information by Dr. rer. silv. Thomas Jung expert for Phytophthora, forest and tree diseases and nurseries
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Phytophthora Picture Gallery - Alder dieback

Alder 21: Coppice test in a 8-year-old, non-flooded common alder (A. glutinosa) plantation; re-infections of sprouts in the second year by P. alni coming from the infected root system.

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Picture 21 of 24