Heart rot of spruce and alder in forests of Latvia

摘要: Heart rot causes great decrease in timber quality throughout the world. In conifer forests of Northern Hemisphere most significant losses are caused by fungi from Heterobasidion annosum species complex. The spread disease is favored forest management, as fungus can use freshly cut stumps an infection court, and so extend through root contacts to infect neighboring trees. The country-scale inventory revealed that about 22% Latvian spruce trees contained heart rot, which extended on average 6.6 m within tree stem; commonly associated being H. parviporum. These facts highlight need take actions reduce level inoculum already infested stands. Stump removal planting resistant two options for that. Long-term trials carried out Scandinavia showed stump could significantly proportion infected regenerated stands, although effectiveness this procedure may eventually with time. addition, method quite drastic adverse influence continuous stand biodiversity productivity should be taken into consideration. trail conducted Finland had a positive impact seedlings growth, but influenced negatively mycorrhization richness. The other management employed species, especially broadleaved trees. work undertaken thesis incidence, decay yield were studied grey (Alnus incana) black alder (A. glutinosa) Despite high incidence number fungal no single s.l. was found. Also, our data size column increased age. suggest short rotation fast growing (not only Alnus, also Populus, Betula, Salix) used clearing up inoculum.