Comparison of efficacy of the biological preparation with some Phlebiopsis gigantea isolates used to protect Scots pine stumps against primary infection of Heterobasidion annosum on post agricultural lands

Abstract

Three products (RotstopF, RotstopS and PGSuspension) based on lyophylised spores of registered isolates of Phlebiopsis gigantea and non−registered Polish PgIBL as a control were tested in Scots pine stumps locat−ed in 3 forest regions (north−west, north, east) of Poland in autumn 2007, spring 2008 and autumn 2008. One year later the presence of: a) subcortical mycelium and b) the fruit bodies of P. gigantea, and c) symp−toms of sapwood decay were counted and compared as Biological Treatment Efficacy (BTE) index. Obtained BTE values inform that generally PgSuspension preparation was the most effective if applied in spring 2008, whereas both Rotstop preparates showed similar and compared effectiveness in all terms of application. The differences in preparation efficacy between forest regions were found