Short-term effects of mechanical and biological treatments on Sorbus aucuparia L. sprouting in mesic forests in Finland
In reforestation areas in Finland, rowan (Sorbus aucuparia L.) can form dense thickets restricting the growth of commercially more valuable conifers. In this study we compared three different management methods to control excessive growth of rowan. These methods were traditional (mechanical cutting 10–15 cm above ground level), 1 m cut height treatment (saplings were cut 1 m above ground level), and biological control (as traditional method, but freshly cut stumps were squirted with mycelium of a fungus, Chondrostereum purpureum [Pers. ex Fr.] Pouzar). The short-term results one year after the treatments revealed that biological control was the best way to restrict rowan sprouting as the proportion of dead stumps was highest. Furthermore, the number and height of stump sprouts were even two times lower in the biological control than in the mechanical treatments. Although the biological control had the highest number of root suckers, the total number of stump sprouts and root suckers together was indicatively lower than in the other methods (p < 0.10). Based on our results C. purpureum treatment seems promising. Yet, more efficient fungus strains and better methods to spread the fungus on stumps are needed before this method is applicable at commercial scale.
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Document Type: Research Article
Affiliations: Finnish Forest Research Institute, Vantaa, Finland
Publication date: 2011-12-01