Internal Microflora of the Woody Tissues of the Standing Norway Spruce. III. In vivo Confrontations

1990

S. 299-307

2 Abb., 1 Tab., 15 Lit. Ang.

Unselbständiges Werk

200041162

Annales des Sciences Forestieres 1990 ; 47 (4), S. 299-307

The author studied 4 non-rotting fungi which may be present in the trunk of Picea abies, either in sound central wood (Nectria fuckeliana = Nf; Phialophora sp = P) or in rotten heart wood (Scytalidium sp = S2 and S38). In order to determine fluence on the pathogen Heterobasidion annosum (= Ha) in the trunk, they were inoculated into trees about 20 yr old), alone or combined with the pathogen. The inoculum was cultivated on a wooden peg under laboratory conditions which was driven into a deep bored hole in the tree. Ha was inoculated at stump height, Hf and P, 50 cm above, in April. S2 and S38 were inoculated at stump height in May. Fungal development was assessed after 10 and 26 months by felling the trees and cutting them into 3- cm thick discs. S2 and S38 were identified by re-isolation and Ha, Nf, P by binocular examination after incubation in wet conditions. Each result is based on 3 inoculated trees. The fungi were generally found to be well established in the central wood, but Ha more irregularly than the others. No discolouration or decay developed, even by Ha. By invading a certain part of the trunk section before the arrival of Ha, Nf and P may obstruct the upward spread of pathogen. Nevertheless, this phenomenon is erratic and it appears unlikely that it would be able to restrain the pathogen for a long period.