A reddish purple stain of red alder by Ceratocys picea and its prevention

Red alder (Alnus rubra), increasingly important in the Northwest for furniture, is particularly susceptible to stain and decay fungi and must be rapidly processed after harvesting. A reddish purple stain that occurs in solid-piled alder lumber causes substantial grade losses. Culturing wood from these stained areas resulted in isolation of Ceratocystis picea, normally a nonstaining fungus on conifers in the western United States. Laboratory tests revealed that this fungus caused reddish purple discoloration of alder coupons but that such staining could be prevented by dipping the wood in 2- (thiocyanomethylthiobenzothiazole) or sodium octaborate tetrahydrate but not zinc naphthenate. Field tests are recommended.

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