Efficacy of different concentrations of Rotstop® and RotstopS and imperfect cover of RotstopS against Heterobasidion spp. infections on Norway spruce stumps
The effectiveness of treatment with two Phlebiopsis gigantea based preparations (Rotstop® and RotstopS) in different concentrations against the root and butt rot causing fungus Heterobasidion annosum s.l. on Norway spruce (Picea abies) thinning stumps in southern Sweden was compared. The trees we...
| Autor principal: | |
|---|---|
| Formato: | L3 |
| Lenguaje: | Inglés sueco |
| Publicado: |
SLU/Southern Swedish Forest Research Centre
2005
|
| Materias: |
| Sumario: | The effectiveness of treatment with two Phlebiopsis gigantea based preparations (Rotstop®
and RotstopS) in different concentrations against the root and butt rot causing fungus
Heterobasidion annosum s.l. on Norway spruce (Picea abies) thinning stumps in southern
Sweden was compared. The trees were cut on three sites during the summer 2004 and 285
stumps were treated manually with 100% cover with two different amounts of spores in
solution corresponding to approximately 5×106 spores/l and 10×106 spores/l. 31 stumps
received mechanical part cover with the highest spore concentrations of Phlebiopsis gigantea, i.e. approximately 20×106 spores/l. Mechanical treatment was assessed for satisfactory treatment effect. Three months later, samples were collected and analyzed.
There was a significant reduction in frequency and relative areas of Heterobasidion spp.
infections on stumps with manual application of control agents compared to untreated stumps. On average 10 to 23% of stumps subjected to manual treatments were infected compared to 52% for the untreated stumps. However, none of the concentration solutions of Rotstop® and RotstopS differed from the others in reduction of Heterobasidion spp. infections. Mechanical treatment failed to control the Heterobasidion spp. infections, but there was a tendency for the 85.1-95.0% cover class to provide better result than the others. Thus, despite of the incomplete control of the pathogen, stump treatment with different concentrations of Phlebiopsis gigantea oidia in suspensions provided equal effects at the present spore loads of Heterobasidion spp. |
|---|