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Phytophthora pathogens cannot be controlled with well−known fungicides, because as oomycetes they do not synthesize chitin and ergosterol. Phytopathogenic microorganisms of Phytophthora genus offers an alternative to pesticides. The aim of the study was to understand the interactions among the host silver birch (Betula pendula), a common forest tree species in Polish lowlands and in lower mountain...
A comparative experiment was carried out in growth chambers to determine the effects of elevated CO2 concentrations (either 760 ppm or 1140 ppm) versus ambient CO2 conditions on the growth of Armillaria ostoyae (Romagn.) Herink rhizomorphs, which is the infectious organ of a fungal pathogen affecting many forest trees. We found that one out of three isolates in the experiment differed significantly...
Comparative cultivation experiment was carried out in the greenhouse to verify the assumption that increased air CO2 concentration (up to 1000 ppm) stimulates the infection intensity and mortality rate of Scots pine and Norway spruce seedlings subjected to the artificial inoculation with Armillaria ostoyae (Romagn.) Herink. It was found that increased air CO2 concentration reduces the intensity of...
A Fibroporia gossypium (Speg.) Parmasto fruit-body was found on a Norway spruce [Picea abies (L.) Karst.] stump in the northeast of Poland (Waliły forest district). The mycelium from wood samples was sequenced (KF725876), identified and used to examine: (i) linear growth of the mycelium on malt-extract medium and (ii) the decay of spruce wood samples. We observed slow mycelium growth (84 mm colony...
The aim of this preliminary study was to assess the activity of laccase, diverse peroxidases as well as the level of micromolecular compounds in Heterobasidion parviporum isolates grown on pieces of Norway spruce wood (sapwood and heartwood) during 50 days of incubation under the laboratory conditions. H. parviporum isolates secreted extracellular enzymes: laccase, manganese peroxidase (MnP), lignin...
Due to the deterioration in the health condition of Norway spruce on the IPTNS-IUFRO 1964/68 observation plots in Krynica (Poland), there was an urgent need to determine the cause of the decline in order to design preventive measures. For this purpose, a health inventory was carried out in the years 2002 and 2003. This included an assessment of the condition of crowns in 144 trees and a thorough examination...
Identification of the Armillariaspecies in selected coniferous stands (Scots pine stands, Norway spruce stands and fir stands) was the aim of the work carried out on the basis of mating tests and consideration of macroscopic traits of fruit bodies. One species of Armillaria [A. ostoyae(Romagnesi) Herink] was found in Scots pine stands, three species [A. ostoyae, A. cepistipesVelenovský and A. borealisMarxmüller...
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