THE SPREAD OF DISEASES IN VOLYN REGION FORESTS

Abstract

Some peculiarities of expansion characteristics and general dynamics of the forest disease cores in Volyn region were studied in Volyn Regional Forestry and Hunting Industry Administration (VRFHIA). The dynamics of sanitary selective and solid felling with area distributions connected with VRFHIA in 2016 was illustrated. The main problems and tendencies of forest sanitary conditions were explained. The area of lesions the most dangerous forest diseases for 2016 if found to increase by 954.8 ha or 3.8 %. Having analysed Volyn region forest sanitary condition the authors have ascertained that generally 1220.5 ha of disease cores were eliminated by means of forest protection activities and written off during the report year. The biggest size is the concentration of Root fungus (Heterobasidion annosum (Fr.) Bref. 1889) and it remained the same as in the previous years. It covers 13961 ha or in other words it is 55 % of general surface of disease cores in this region. 5117 hectares need some methods of felling. Root fungus (Heterobasidion annosum (Fr.) Bref. 1889) has developed rapidly because of the long lasting drought season and the ground water level decrease. During 2016 Volyn RFHIA enterprises tried to solve the problem by solid sanitary felling in the areas of 332 ha with disease concentration. This is 2.4 % of the general land area of these nucleuses. The most common forest diseases are defined to be as follows: stem rot (Fomes fomentarius (L) Fr.1849) – 2363 hа; aspen fungus (Phellinus tremulae (Bondartsev & P. N. Borisov 1953) – 993 hа; diametrical Oak cancer (Pseudomonas quercus Schern.) – 922 hа; oak fungus (Daedalea quercina (L.) Pers.1801) – 676 hа; birch polyporus (Piptoporus betulinus (Bull.) P. Karst.1881) – 657 hа; red rot (Phellinus pini) – 562 hа; pitch streak (Cronartium flaccidum (Alb. & Schwein.) G. Winter 1880) – 369 ha; alder fungus (Phellinus igniarius (L.) Quél. 1886) – 313 ha; bacterial ash cancer (Pseudomonas savastanoi (Janse 1982) Gardan, et al., 1992) – 216 ha; much smaller (Armillariella mellea (Vahl) P. Kumm. 1871) – 183 hа. In order to protect and preserve forests when forestry proceedings, a complex of sanitary and recreational events and sanitary requirements are taking place.

Keywords

• sanitary cuts
• wood decay
• sanitary condition of the forests
• dynamics of diseases and pests
• plantings affected by pathogens