Influence of Nectria ditissima (Tul.) canker on wood volume of beech (Fagus sylvatica) in Obcinile Humorului (N. E. of Romania)

The present work is the subject of some research carried out on similar stands in terms of composition and age, located in the mountain beech floors, in two forest management units of Gura Humorului Forest District. The purpose of this research is quantification of the losses of wooden mass due to bark disease attack and to show the causes that led to the appearance of infestation. Its development was made on the basis of data collected and recorded during the field campaign. In order to cover the statistics of the investigated areas, circular sample plots (500 m2) were randomly distributed in the stands. The working method used was observation and measurements. All the trees from these surfaces were inventoried by species and biometric elements, the existing pathogen and the losses of wood mass produced were identified. It has been shown that the pathogen pursued can produce major material and economic losses for the forest district that manages these stands. Research has shown that Nectria ditissima is the main pathogen with the strongest attacked form on beech (Fagus sylvatica). The main recommendation is to avoid the injury of the trees during the harvesting process, to protect the trees next to the road during the harvest period.