Control of Heterobasidion annosum by Stump Treatment with "Rotstop", a New Commercial Formulation of Phlebiopsis gigantea : Root and Butt Rots

Uppsala

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

1994

S. 675-685

21 Lit. Ang.

Bandaufführung

13462

73846

Preliminary stump treatment experiments in Finland have indicated that Phlebiopsis gigantea can be as effective as urea in preventing aerial infection of Heterobasidion annosum in both Norway spruce and Scots pine stumps. In 1991, a strain of Phlebiopsis gigantea, isolated from spruce wood in Finland, was formulated into a dry powder containing c. 10 hoch 7 oidia/g. In nine field tests, carried out manually in spruce forests in Finland and in spruce plantations on former arable land in Sweden and Norway, the efficacy of 0.1 and 0.5% suspensions of the preparate was compared with that of 30% urea. The number of stumps infected by Heterobasidion annosum, number of Heterobasidion annosum colonies, and the proportion of infected wood in stumps were determined after c. 3 months. The mean control efficacy of the preparate was 97, 99 and 99%, respectively, and that of urea 84, 92 and 93%. In three experiments where the stump treatment was done automatically during mechanical felling in pine forests in Finland, the mean efficacy of the preparate was 93, 97 and 95%, respectively. Phlebiopsis gigantea colonized most of the sapwood in treated pine and spruce stumps. In Finland the preparation is now registered as a biological pesticide, Rotstop, for use in both spruce and pine stumps.