Biological Control of Armillaria Root Rot (Armillaria ostoyae) in Pine Forests in the South-West of France : Screening in Vitro of Wood Decay Fungi : Root and Butt Rots

Uppsala

International Union of Forest Research Organizations, Swedish University of Agricultural Sciences

1994

S. 696-711

8 Lit. Ang.

Bandaufführung

73852

Armillaria, is the most pathogenic and widespead of the Armillaria spp. found on the maritime pine in the Landes of Gascony. 36 isolates of wood decay Basidiomycetes isolated from (1) well decayed or (2) freshly cut pine stumps were screened in vitro (A) for their capacity to invade pine wood (competitive phenomenon) and (B) for their combative ability against Armillaria ostoyae (antagonistic phenomenon). This double screening was carried out as a means of selecting fungi to be used in field tests for biological control. Among the 36 test isolates, three of them, Gymnopilus spectabilis, Hypholoma fasciculare and Bjerkendera adusta, more common in the pine forest and isolated from well decayed pine stumps, were strongly combative against Armillaria ostoyae in curative and preventive control situations. Unfortunatly, Peniophora gigantea, used in Heterobasidion biocontrol in England, and all the wood decay fungi isolated from freshly cut pine stumps had poor antagonistic capacities against Armillaria in the wood. For use in a preventive biocontrol, in the forest situation, the ability of wood decay fungi to quickly colonize freshly cut pine stumps could be an important attribute in the processus of selection. So, it is necessary to evaluate the behaviour of the three combative fungi (Gymnopilus spectabilis, Hypholoma fasciculare, Bjerkendera adusta) on freshly cut pine stumps.