55 research outputs found

    Impact of forest fire on occurrence of Heterobasidion annosum s.s. root rot and other wood-inhabiting fungi in roots of Pinus mugo

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    Forest fires result in disturbance of wood- and soil-inhabiting fungal communities and also have an impact on the persistence of rot-causing fungi that are present in infected root systems. The aims of the present study were to (1) investigate the occurrence of the root pathogens Heterobasidion and Armillaria in root disease centres on burned and non-burned sites in Pinus mugo forest and (2) study the impact of forest fire on the community structure of other wood-inhabiting fungi colonizing tree roots. A total of 18 root disease centres were investigated in 120-year-old plantations on sandy dunes in the Curonian Spit of western Lithuania, 14 of which were located on burned and 4 on non-burned sites. A total of 484 fungal isolates representing 16 taxa were obtained from 270 P. mugo root systems sampled at 10–30 cm in the soil. The two most frequently isolated fungi were Trichoderma viride and Penicillium sp. found in all disease centres and 96.7 per cent and 39.6 per cent of root systems, respectively. Heterobasidion annosum s.s. was the most commonly isolated basidiomycete found in 15 disease centres. Overall, it was isolated from 19.3 per cent of the root systems. The fungus gave growth from 42.5 per cent of root systems on non-burned and from 15.2 per cent of root systems on burned sites, and the difference was statistically significant (chi-squared test; P < 0.001); thus forest fire in disease centres seemingly had reduced occurrence of the pathogen. Nevertheless, H. annosum s.s. persisted on 11 burned sites, and on four of those fresh sporocarps were observed. Armillaria borealis was less commonly isolated (3.0–5.0 per cent of the root systems)Vytauto Didžiojo universitetasŽemės ūkio akademij

    A review of studies on heterobasidion and its control in Latvia

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    Approximately 50% of the total area of Latvia is covered by forest: of which 35% is dominated by Scots pine (Pinus sylvestris) and 18% by Norway spruce (Picea abies)

    European Fraxinus species introduced into new Zealand retain many of their native endophytic fungi

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    Fraxinus species were introduced in to New Zealand as amenity trees as early as the mid-1850s. As a likely consequence of this early introduction and of their geographic isolation, Fraxinus species in New Zealand have not yet been subjected to the devastating impacts of ash decline caused by Hymenoscyphus fraxinus. This study used isolations, PCR and cloning methods to examine the endophytic fungi associated with Fraxinus excelsior and F. angustifolia on the north island of New Zealand
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