Abstract
CERTAIN species of Poria causing brown rot in wood, including P. vaporaria (Pers. ex Fr.) Cke., P. vaillantii(D.C. ex Fr.) Cke., P. xantha (Fr.) Cke., and P. monticola Murr., are much more resistant to the toxic effects of simple copper salts than are most wood-destroying fungi, but have been readily inhibited by the copper–chrome–arsenate preservatives which are now in common use1. During woodblock tests of wood preservatives in this laboratory, however, one strain of P. vaillantii was found to be unaffected by these preservatives at the usual concentrations, and the tolerance of various strains of the species was therefore investigated by testing their ability to decay sawdust treated with increasing concentrations of such preservatives, using a modification of the sawdust dish – soil jar decay resistance test of Da Costa and Rudman2
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