Research Concerning Drying Phenomena in Quercinae Forests from Cluj Area, Romania

Constantin ȘULEA, Ioan OROIAN, Ilie COVRIG

Abstract


Because of the negative evolution of the health status of Romanian Quercinae (mainly durmast and oak) forests, a serious analysis is imposed, in order to be applied to managerial methods of these forests. This paper aims to emphasise the main phenomena of oak and durmast forest damages, and their most important causes, in Cluj area. The experimental period was between 2012 and 2013. The experimental field was located within 20 arrangements units from the Forestry Area Office Cluj - Napoca (46046’0’’ N și 23036’0’’ E), and Forestry Area Office Gherla (47001’36’’ N și 2300’36’’ E) from the county of Cluj. The biological material consists in Quercinae trees represented by durmast and oak. Tree classification upon Kraft classes was performed, and attack degree of most important pests and pathogens, green oak moth and powdery mildew, respectively were recorded and quantified. The high percent - 19.33% - of damaged trees, is due to the action of the green oak moth in which an average attach degree of 25.45% was reported, is respionsible for 62.62% of damages, 25.27% being result of powdery mildew attack, an average of 42.67% being reported by experimental period for this pathogen.  The drying phenomena in trees crwon is responsible for 8.73%, dried thin branches - 15.52% and dried thick branches - 12.13%.


Keywords


sample, arrangement unit, green oak moth, powdery mildew, Kraft classes.

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