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Albino strains of  Ophiostoma floccosum ,  O. piceae  and  O. pluriannulatum  were selected and screened for biological control of sapstaining fungi on New Zealand radiata pine ( Pinus radiata ). Albino strains were obtained through matings and single ascospore isolations from cultures of prevalent species in New Zealand. These strains do not synthesize the melanin-like hyphal pigments of common sapstaining fungi. Additional mating studies were also carried out to obtain isolates of  O. piceae  and  O. floccosum  that lacked pigmented fruiting structures. Several albino isolates of  O. piceae  with colorless synnemata and isolates of  O. floccosum  with little to no synnemata were obtained. Biological control potential of the albino isolates was evaluated in the laboratory by challenging them on wood chips with fungi that cause extensive sapstain in pine,  Leptographium procerum ,  Ophiostoma piliferum  and  Sphaeropsis sapinea . Many albino isolates of  O. floccosum ,  O. piceae  and  O. pluriannulatum  were effective in stopping the challenge fungi from staining wood chips and were fast growing and colorless when grown unchallenged on wood chips. Selected albino isolates of  O. pluriannulatum  were used in two field trials in New Zealand to control sapstain. Several strains were found to significantly reduce dark sapstain as compared to the untreated control logs.

Albino Strains of Ophiostoma Species for Biological Control of Sapstaining Fungi