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Since its initial discovery in 1945, pitch canker caused by Gibberella circinata (anamorph Fusarium circinatum) has become one of the most important pine diseases in the world. It infests 57 pine species (including Pinus sylvestris) and Douglas−fir. F. circinatum has been reported in both nurseries and forests on all continents except Australia and Oceania. Both vegetative and reproductive parts of...
Dieback of common ash is a worrying phenomenon that emerged in the early 1990s. The first symptoms were observed in 1992 in Poland. In 1996 the plague appeared in Lithuania, followed by Germany, Denmark, Czech Republic, Austria, Slovenia, Sweden and France (2002−2009), to finally reach the British Isles in 2012. At the beginning it was said about the disease of ash, but a few years later it became...
Northern red oak (Quercus rubra) is the most common alien tree species in Polish forests that is considered as an invasive one. It is native to North America. Negative impact of Q. rubra on natural habitats in Europe is well−known, but there is still a lack of information about correlations between red oak and individual species or groups of plants. Especially knowledge about impact of Q. rubra on...
Oak decline is insufficiently described problem. Declining oaks are in various age and the most commonly observed symptoms of the disease include growth inhibition and buds mortality. The dieback occurs periodically, mainly because of the impact of abiotic factors (drought, frost and the lowering of the groundwater level). In this complex phenomenon the biological factors, including numerous species...
Phytophthora and Pythium species (Oomycota) are known to be serious pathogens of forest trees. Little is known, however, about their presence in Polish oak forests and their role in the oak decline, especially in the flooded areas. The aim of this study was (1) to detect and compare populations of microorganisms from Oomycota and fungi in roots and soil of healthy and declining pedunculate 30−126...
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