When studying biological control of blue stain an interesting phenomenon of parasitism by some white rot fungi on blue stain fungi has been encountered. The majority of the 22 tested white rot fungi act parasitically upon blue stain fungi. The most interesting species among them is Bjerkandera adusta (Willd. ex Fr.) Karst., causing almost complete or complete decoloration of the hyphae of the blue stain fungi in culture on agar substrate. Obviously, complex enzyme reactions are involved; the main role probably performed by peroxidases. Bjerkandera adusta (Willd. ex Fr.) Karst., acted similarly upon blue stained wood, which was rapidly bleached.

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