Occurrence of disease symptoms and selected biotic factors connected with beech (Fagus sylvatica L.) dieback phenomenon in stands of the Magurski National Park [Poland]
2005
Rojek, P.,Akademia Rolnicza, Krakow (Poland). Katedra Fitopatologii Lesnej
This paper presents evaluation of frequency of disease symptoms occurrence in the crowns and on the trunks of beeches. In each stand 50 trees, growing side by side in center of the stand, were analysed. Among 600 analysed trees of Fagus sylvatica, 2.6 percent had a dead top. Crown thinning were present on 51.8 percent of trees. It appeared frequently in higher age class stands and didn't cover more than 1/4 of the crown. Moreover, in crowns of 4.1 percent of trees the leaf chlorosis appeared. The most frequent symptom on trunks of beeches were local necroses (98 percent of trees), that were sometimes connected with slime fluxing (3.3 percent). Necroses were the most number in stands growing on the southern exposition and on south parts of the trunks. Cryptococcus fagisuga appeared mostly in high age class stands. Intensity of its appearance was similar on the trees growing on the southern and northern exposition (respectively, 48.3 and 53.3 percent). Ascodichaena rugosa appeared on 8.6 percent of trees, more frequently on their north parts of the trunks (7.3 percent). In the places colonized by fungi A. rugosa, insect C. fagisuga was absent. Occurrence of larvae of Ectoedemia liebwerdella was mostly found on trunks of beeches growing on the southern exposition (43.0 percent), on 35.3 percent of trees they colonized south parts of trunks
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