Origins
Leucostoma keunzei or “Valsa kunzei” (Fr.:Fr) Fr. (conidial state -Cytospora kunzei) was first described by Waterman in 1955,as the causal agent for the branch and stem cankers she observed on Douglas fir. Waterman cultured the fungus from cankered trees from Washington, Pennsylvania, Vermont, New Hampshire, and Massachusetts and provided the first descriptions of the canker and fungus. She also noted cankered trees usually occurred on unfavorable sites or had been weakened by other environmental factors.
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