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An inventory of wild cherry trees in the Wielkopolski National Park was made during 2007-2008. Totally, 1098 specimens of the species, in 86 forest compartments were inventoried. There were 28 monumental trees among them; the biggest one of 30 m height and 197 cm of circumference. The habitat conditions of Prunus avium occurrence on its natural sites of the Wielkopolski National Park show a wide range. Wild cherry grows here on soils representing eight types – most often on lessivè and rusty soils. In the typology of forest habitats, the species, occurs most often on habitats of a fresh deciduous forest sites, a fresh mixed deciduous forest sites and a fresh oak-pine forest sites. Also the community context of its sites shows a wide range. Wild cherry trees were recorded in eight forest plant communities – the most frequent in phytocoenoses of oak-hornbeam forests Galio sylvatici-Carpinetum, acidophilous oak forests Calamagrostio arundinaceae-Quercetum and continental pine-oak forests Querco roboris-Pinetum.
Incidence of Armillaria root disease and the population structure of associated Armillaria spp. were studied in 5-17-year-old Scots pine plantations in west-central Poland. Two infection centres (1.14– 9.30 ha) in each of three forest districts (Siemianice, Zielonka and Złotów) were intensively sampled. Root collars were examined for mycelial fans, decayed wood, and rhizomorphs. Twenty two isolates of Armillaria ostoyae collected from epiphytic rhizomorphs from 20 living and two dead trees in the six infection centres were identified with somatic incompatibility group. Only one somatic incompatibility group for A. ostoyae was found. Twenty one isolates produced rhizomorphs on oak-wood discs submerged in a sand-forest soil substrate. Isolates from Siemianice formed the smallest rhizomorph networks and those from Złotów the most abundant. There were 16 different genets among 22 isolates of A. ostoyae distinguished by RAPD analysis. Genetic similarity among genets was 25.6–97.5%. The large diversity in A. ostoyae suggests that sexual reproduction may occur in nature more often than expected.
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