Selective Felling Research Articles

Assessment of the sanitary condition of forests using remote sensing

The pathological drying of coniferous plantationsand mass damage of tree stands by pests and forestdiseases is observed in many countries in the worldand in Ukraine during last two decades. The areaof forests with unsatisfactory sanitary condition isincreasing. In sparsely forested Ukraine, the problems of forest degradation, reduction of its productivity and resistance to adverse environmental factors have become an argent due to the need for the transition to sustainable forestry.In recent years, there has been an intensificationof forest pathological processes in the forests of Ukrainian Polissya, which are chronic and lead to the drying of pine plantations. In many cases, significantdrying of stands occurs rapidly, often during one growing season, and in the medieval, ripening, ripe and overripe plantations of natural origin, in favorable conditions for the growth of pine forest plants. The main signs of modern forest degradation in Ukraine, as well as in Europe in general, include mass deforestation, increase in the number of pests and foci of fungal diseases in forest stands, weakening of homeostatic connections between individual components of forest coenoses, etc. Already in 2003, in the forests of the enterprises of the State Forestry Committee of Ukraine, continuous sanitary felling in drying plantations was carried out on an area of over 11.5 thousand hectares, and selective felling — on an area of almost 140 thousand hectares. The area of forests, which require the immediate implication and measures to control diseases and pests, exceeded 370 thousand hectares (more than 6% of forested land).Effective protection of forests from pests and diseases is possible under the conditions of prompt detection and monitoring of breeding grounds for pests and infections. In modern conditions, the remote sensing from the spacecraft, ie satellite monitoring of forest ecosystems, is a progressive and economically sufficient method for assessing pathological processes in forests

Ecological consequences in forest stands subject to anthropogenic impact during logging and transport operations

The article presents the results of experimental studies reflecting the ecological reality of the consequences of the standard logging process, in which the destruction of the remaining forest stands takes place. The main environmental factors of anthropogenic impact on forest plantations, passed through selective felling using forestry equipment, are disclosed. The main regularities have been identified and formalized, allowing to quantify the damage caused to trees left on the cutting area. Statistical data of experimental observations of damage to forest stands are given, depending on the conditions of their growth. The obtained patterns are implemented in the Predic applic 1.0 software package, officially registered with Rospatent.

Diversity of minute tree-fungus beetles (Coleoptera: Ciidae) of primeval and managed beech forest of the Carpathian Biosphere Reserve

The study of factors that affect to the biodiversity of forest insects has not lost its relevance for several decades. As obligate fungicolous, minute tree-fungus beetles (Coleoptera, Ciidae) are one of the main destructors of saproxylic fungi. Since primeval forests are characterized by different age of tree stands and a large volume of dead wood of different stages of decomposition – the number of saproxylic fungi, and, as a consequence, minute tree-fungus beetles, show a high variety. In managed forests, selective felling and removal of dead wood is carried out, which leads to the loss of habitats and, as a consequence, to the impoverishment of the biodiversity of minute tree-fungus beetles. The fauna of minute tree-fungus beetles of primeval beech forest of the Uholsky massif of the Carpathian Biosphere Reserve and managed 150-year-old beech forest from adjacent territories has been studied. According to the literature, at the beginning of our research the fauna of Ciidae were consisted 34 species of fauna of the Ukrainian Carpathians, and 11 species were known for the beech primeval forests of the Uholka Shyrokyi Luh preservation massif of the Carpathian Biosphere Reserve (CBR). The material was collected with the combined window-type traps (polytrap) during the growing season 2017-2018. In general, 3302 specimens of minute tree-fungus beetles, belonging to 31 species from 8 genera, were collected and identified. For the first time for the region of the Ukrainian Carpathians were indicated such species: Cis rugulosus Mellie, 1848, Cis striatulus Mellie, 1848, Ennearthron pruinosulum (Perris in Abeille, 1864) and Rhopalodontus strandi Lohse, 1969. Taking into account our research and literature data, the faunal list of minute tree-fungus beetles for the Ukrainian Carpathians include 38 species. The species richness of beech primeval and 150-year-old managed forest is close in value, and the relative density of individuals in primeval forest is three times higher than its value in managed forest. Thus, 30 species from 8 genera (2442 individuals) have been identified for primeval beech; for managed beech forest – 28 species from 8 genera (860 specimens of minute tree-fungus beetles). Primeval beech forests are an important center for the diversity of minute tree-fungus beetles, because of the 38 species known from the Ukrainian Carpathians, 31 species have been registered in the Uholsky massif of the Carpathian Biosphere Reserve.

Changes in diversity of protected scree and herb-rich beech forest ecosystems over 55 years

Abstract Species composition along with spatial and age structure are the main attributes of forest ecosystems. The diversity of scree forests and herb-rich beech forests was analyzed in the Broumovsko Protected Landscape Area, the Czech Republic. The paper objective was to evaluate forest structure and dynamics of species diversity of tree layer, natural regeneration and herb layer in the period 1961–2016. Scree forests were structurally, and species very rich forest stands, in herb-rich beech forests the stands were of medium richness. Studied stands managed by small-scale methods, in the past especially by coppicing and later by shelterwood and selection felling, have maintained high species biodiversity during the 55 years of observation. Substantially higher biodiversity was found out in scree forests compared to herb-rich beech forests. Based on the comparison of predominantly coppiced forest stand and stand of generative origin at sites of scree forests, coppice have maintained higher biodiversity than high forests. Species richness increased during the observation period, but species evenness had mostly decreasing tendency. Species heterogeneity in coppiced scree forests increased in tree layer and natural regeneration, but it decreased in herb layer; inverse dynamics was observed in the high forests. Changes in biodiversity dynamics were remarkable for coppice, while high forests showed relatively high level of stability. During study period herb population of light-demanding species and species characteristic for broadleaved forests decreased, while an increase in shade tolerant, moisture-demanding and nutrient-demanding species, especially nitrophilous species was confirmed. Moreover, occurrence of thermophilic plants increased, respectively cold-tolerant plant population decreased in relation to climate change.

Фітосанітарний стан зелених насаджень міста Херсон

Проаналізовано фітосанітарний стан зелених насаджень міста Херсон, багатий видовий склад дерев і кущів якого зумовили широкий спектр патогенних організмів та шкідників, що їх уражають. З'ясовано, що підвищення техногенного навантаження в урбанізованих екосистемах призвели до зниження життєздатності деревних рослин-едифікаторів Херсона. Встановлено, що патогенними організмами уражаються 45 видів досліджених деревних рослин міста. Виявлено, що найбільш вразливими до патогенних організмів є Acer negundo L., A. platanoides L., A. saccharinum L., Quercus robur L., Tilia cordata Mill., Aesculus hippocastanum L., Juglans regia L., Fraxinus excelsior L. За інтенсивністю пошкодження, яке впливає на життєвий стан рослин та їх декоративність, найбільш вразливими до дії фітопатогенів та ентомошкідників виявились Aesculus hippocastanum L., Buxus sempervirens L., Buxus sempervirens (Du Roi) Moench, Prunus divaricata Ledeb., Rosa canina L., Pinus pallasiana D. Don, Picea pungens Engelm., Juniperus virginiana L. З'ясовано, що низка дерев і кущів (Quercus rubra L., Betula pendula Roth, Betula pubescens Ehrh., Cotinus coggyria Scop., Sophora japonica L., Gymnocladus dioicus (L.) Koch, Mahonia aquifolium (Purh.) Nutt., Maclura acuminata L., Populus simonii Carr., Eucomia ulmoides Oliv., Albizia julibrissin Durazz, Symphoricarpos albus (L.) Blake, Ginkgo biloba L., Taxus baccata L.) є стійкими до дії шкідників та хвороб. Дослідження показали, що різні типи насаджень відрізняються за видовим складом патогенних організмів, а також за інтенсивністю пошкодження рослин-господарів. У паркових насадженнях частіше трапляються хвороби та шкідники листя або хвої деревних рослин. У вуличних насадженнях деревні рослини частіше пошкоджуються збудниками стовбурових і кореневих гнилей, листя рослин пошкоджуються американським білим метеликом та комахами-мінерами. Появі уражень та захворювань сприяють перестиглий вік насаджень, велике рекреаційне навантаження на зелені зони, а також відсутність регулярного кваліфікованого догляду за насадженнями. Тому на території дослідження рекомендовано проведення рубок формування та вибіркових санітарних рубок, а також регулярне та своєчасне здійснення агротехнічних заходів.

Regeneration of native woody species following artificial gap formation in an early‐successional forest in New Zealand

SummaryGap creation in recovering rainforests may reduce the intensity of competition and provide opportunities for later successional species to co‐occur with predominant earlier successional species. This study examined the potential of artificial gaps to facilitate the natural regeneration and establishment of woody species in dense regenerating stands of Kānuka (Kunzea robusta) that have developed following the removal of degrading factors especially clearing and grazing in many parts of New Zealand. Artificial gaps were created through selective felling of Kānuka canopy trees and the species composition, density, growth and survival of native woody species regenerating in the canopy gaps and under paired intact Kānuka canopies were monitored for 28 months. Gap creation resulted in a significant increase in the number of species and density of woody regeneration including a wider range of woody species, although no mature phase species (including podocarps) were found, potentially due to seed limitations. There was no significant effect detected with respect to the interaction of time and gap creation on species recruitment. Survival and growth of woody regeneration were significantly greater in canopy gaps than beneath the intact canopy despite the higher proportions of herbaceous ground vegetation and browsing incidence in gap treatments. The tendency of woody seedlings to grow taller in canopy gaps may have permitted them more rapid recovery from browsing. The duration of the study was too short to fully capture the potential of canopy intervention, but woody regeneration within the artificial gaps is likely to accelerate as the regeneration proceeds, especially if browsing is controlled, and the results presented here provide useful insight into the early stages of this process.

Comparing the effects of even-aged thinning and selective felling on boreal forest birds

Biodiversity is in decline and therefore alternative forest management approaches have gained interest. One of such approaches is uneven-aged silviculture, which has been suggested to better maintain mature or late-successional forest characteristics and species assemblages than even-aged silviculture. Therefore, it is assumed that uneven-aged silviculture can be a useful tool for landscape planning to benefit biodiversity. Nevertheless, there is a lack of empirical studies regarding bird responses to uneven-aged silviculture in north European boreal ecosystems. Here we test the similarity of bird assemblage structure between mature forests within even-aged silviculture (‘thinning’) and uneven-aged silviculture (‘selective felling’). In spring 2018 we censused breeding birds using territory mapping in 14 thinned stands and 14 selectively felled stands. We found higher abundance and different bird assemblages in thinned stands compared to selectively felled stands. The pied flycatcher, tree pipit and great tit contributed most to the variation of bird assemblages between the two management types. None of the species were more abundant in selectively felled than in thinned stands. According to functional guilds, the abundance of ground breeders, ground feeders and generalists was higher in thinned stands than in selectively felled stands, similar results were found in the species richness of long-distance migrants, ground nesters, secondary cavity nesters and generalists. Independent of management type, time since treatment had an overall effect on assemblage structures, the mistle thrush and wren were negatively correlated with time since treatment, while the chiffchaff showed the opposite trend. Our results suggest that at these locations and given this particular type of uneven-age management, selective felling is less suitable for some abundant generalists than even-aged forest stands reaching the thinning age. However, the results from this study does not provide clear management recommendations aiming to maintain biodiversity, as management guidelines should be based on red-listed species and not on common generalists. Nevertheless, our results stresses the urgent need for more long-term studies comparing the effect of these different silvicultural strategies on bird assemblages.

Висотно-поясні особливості всихання ялинників на північно- східному мегасхилі Українських Карпат

Проаналізовано особливості поширення всихання ялинових насаджень у висотному діапазоні гір 350–1 400 м над рівнем моря на прикладі басейну річки Бистриця Солотвинська північно-східного мегасхилу Українських Карпат. Охарактеризовано кількість і площі осередків часткового та суцільного вс ихання для висотних поясів – передгірних ялицево-букових і гірських буково-ялицевих, буково-ялицево-ялинових і ялинових лісів. Наведено верхню межу поширення всихання. Розраховано емпіричні залежності площ осередків різних видів цього явища від гіпсометричних рівнів гірської системи. З’ясовано, що найбільш уразливою до всихання є ялина на висотах 400–900 м н. р. м. Оцінено вплив експозиції та крутизни гірських схилів на поширення процесів усихання. Виявлено, що в передгірних умовах важлива роль у стійкості похідних ялинників належить ландшафтно-лісівничим особливостям. У цих умовах процеси всихання насаджень найменш активно відбуваються в глибині лісових масивів, дещо активніше – на ділянках, що межують із галявинами, зрубами й молодняками, і сягають максимуму в смугах узлісся.

Yield and quality of intercropped wheat in jujube‐ and walnut‐based agroforestry systems in southern Xinjiang Province, China

AbstractAgroforestry is widely practiced in China and has the benefit of diversifying agricultural production and enhancing natural resource utilization; however, these systems create competition for light between trees and understory crops. We investigated the effects of shading by jujube (Zizyphus jujuba Mill.) and walnut (Juglans regia L.) trees on the yield and quality of intercropped wheat (Triticum aestivum L.) in agroforestry systems in southern Xinjiang Province, China. In the walnut–wheat intercropping system, mean daily photosynthetically active radiation (PAR) and net photosynthetic rates (Pn) in the understory were reduced by 72.4–79.7% and 45.8–49.6%, respectively, at the grain‐filling stage as compared to wheat grown in monoculture. Relative to monoculture wheat, the walnut‐based system resulted in significant reductions in the number of florets and spikelets per spike, grain‐filling rate, and grain yield and its components in intercropped wheat. In contrast, N and P concentrations, and protein and wet gluten contents of intercropped wheat were significantly increase. In the jujube–wheat intercropping system, mean daily PAR and Pn in the understory were reduced by 23.2–25.5% and 27.2–34.3% at the grain‐filling stage compared to monoculture wheat, but grain yield and its components, the number of florets and spikelets, N and P concentrations, and protein and wet gluten contents of wheat did not differ between the two systems. The jujube‐based agroforestry system was more sustainable than the walnut‐based system in our study region, but competition for light between walnut trees and intercrops may be alleviated by selective felling, pruning, and wider tree spacing.

THE TROPHIC STRUCTURE OF THE SUBCORTICAL ENTOMOFAUNA OF COLEOPTERA IN THE DECIDUOUS PLANTATIONS OF THE HOMILSHA WOODS NATIONAL NATURE PARK

The research was carried out in 2019/2020 in the Homilsha Woods National Nature Park in the plantings with different levels of anthropogenic load: an economic area (with selective sanitary felling in 2017); ‘recreation + felling’ in winter 2019); a protected area; an area of regulated recreation; an area of stationary recreation. A total of 63 species from 49 genera of 23 families of subcortical Coleoptera with the predominance of Cerambycidae and Curculionidae: Scolytinae were identified. Xylophages (23 species, or 36.5%) and entomophages (16 species, or 25.4%) predominated in terms of the number of species. Saproxylophages included 13 species (20.6%), xylomycetophages – 7 species (11.1%), myxomycetophages – 3 species (4.8%), mycetophages – 1 species (1.6%). Xylophages are represented in four families, xylomycetophages in two ones, entomophages in eight ones, saproxyphages in eight families, and mycetophages in one family. In the area of regulated recreation, 37 species of subcortical Coleoptera were identified (58.7%), in the areas of stationary recreation and protected area – 25 and 32 species, or 39.7 and 50.8%, respectively. In the plantings of economic and recreational ones, where selective felling was carried out, 27 and 25 species were identified respectively (42.9 and 39.7% of the total number of detected species). In the economic and recreational areas, where selective felling had just been carried out, xylophages accounted for 51.9 and 56%, and entomophages for 18.5 and 20% of all subcortical Coleoptera species found in each area. In the protected area and the area of regulated recreation, xylophages make up 25 and 29.7% respectively, and entomophages – 28.1 and 24.3%, respectively. With the help of the Sorensen-Chekanovsky index, the plantings with the high similarity of the subcortical fauna of Coleoptera were determined as: 1 – areas of economic and recreational areas where felling was carried out, and 2 – areas of the protected area and regulated recreation area.

Роль обліку в припиненні незаконних рубок лісу

The article is aimed at researching the impact of a properly organized accounting system in forestry enterprises in the termination of illegal felling of forests. The development trends together with the status of accounting support of forestry enterprises affecting the volume of illegal felling are analyzed. On the basis of the study of tax legislation and statistical data on the volume of felling by types and systems, as well as the amount of revenues from rent for special use of forest resources, the need to abolish the norms for reducing rent on selective felling, as well as felling on the formation and sanitation of forests is substantiated. The problem of the accounting-methodological nature, which contributes to illegal felling, – the non-display in the accounting and financial statements of biological assets of the forest is determined. This is a fundamental problem of accounting in the forestry industry, which does not allow to ensure proper control over the preservation and reproduction of forest resources, to form the real value of the forest, the self-cost of manufactured products and to reliably evaluate the work of the industry as a whole. The need for further implementation of electronic timber accounting and its maximum combination with the accounting system of forestry enterprises is substantiated. International experience in the use of modern technologies in the organization and accounting of forestry activities is studied. As a result, it is proposed to implement in Ukraine the following: inventory and value assessment of forests, including laser scanning; creation of digital maps of forests; formation and use of DNA databases of wood, etc. The carried out research concluded that there are legal, organizational, methodological and technical factors that relate to accounting and prevent illegal felling of forests.

Constructive solutions to improve cable haulers for development of hard-to-reach cutting areas

The article proposes a constructive solution for improving the technological process of logging wood with rope skidders under conditions of an extended distance of the primary haulage of wood and a considerable length of a hauling-carrying rope for hilly-ridge and waterlogged production conditions, including for selective felling (especially relevant in the Northwestern Federal District of the Russian Federation , especially in the Leningrad region, where timber harvesting in the forests of the first category predominates). The proposed solution is a double-structure carriage, obtained by connecting the mounting of the travel wheels with two articulated joints, without changing the standard designs of the existing carriages. This design allows the carriage to provide the passage of turns with a bundle of skidded timber on the curved track of the carrying rope. When introducing rope skidders with articulated carriage (SHSK), the possibility of turning the track will expand the area of the available logging fund. The use of cable scudding systems with SHSK will allow organizing skidding routes, without significant wear of the ropes, with turning angles up to 45 degrees.

Методы снижения повреждаемости стволов деревьев при выборочных и санитарных рубках леса

Методы снижения повреждаемости стволов деревьев при выборочных и санитарных рубках леса

Отток и распределение 14С-ассимилятов у ели при выборочных рубках в северотаежных фитоценозах

Отток и распределение 14С-ассимилятов у ели при выборочных рубках в северотаежных фитоценозах

The status of some herbaceous species populations in West Siberian subtaiga forests

The coenopopulations of Bupleurum longifolium L., Pulmonaria mollis Wulf, ex Hornem., Angelica sylvestris L were studied in the territory of the experimental forest park of CSBG (Novosibirsk). The coenopopulations have a left-sided spectrum. The main method of reproduction of species − seed. In the intact pine-birch forest, coenopopulations of species with a low density of individuals develop. In weakly disturbed habitats (selective felling, periodic haying) the densities of individuals in B. longifolium, P. mollis increases, as well as old (in B. longifolium) or juvenile (in A. sylvestris) individuals fall out. Improving lighting here causes an increase in the size parameters of generative individuals and the acceleration of their development.

Identifikasi Kondisi Pohon Peneduh Terhadap Keselamatan Manusia Menggunakan Logika Fuzzy Mamdani

The condition of shade trees is very important for the safety of road users. It often happens in shade trees because of the factors of temperature, climate, air damage, and lack of oxygen in the tree. The purpose of this study is to study the health conditions in shady trees against human safety. So to overcome the problem in this study, a selective felling program in shady trees will bemade using the fuzzy logic method to solve the problem of existing factors by creating variables that will be used in processing on fuzzy logic. The results of this study are to identify which health conditions of trees that are feasible to be cut according to the results of fuzzy logic.

DIAGNÓSTICO PRELIMINAR DE LA PRESENCIA DE PRIMATES QUE HABITAN EL PIEDEMONTE DE LA RESERVA BIOLÓGICA COLONSO-CHALUPAS

Mammals, especially primates, have an important role as dispersers of seeds and as engineers of the ecosystem they occupy. The status of primate populations may be determined by the distribution of their food, population density and interaction with other species, but may also be highly conditioned by human impact. This study collected behavioral and distribution information on primate populations and their threats in three 3km long trails, in the foothills of the Colonso-Chalupas Biological Reserve, adjacent to Kichwa communities in Ecuador. The study was carried out through linear transects and interviews during a period between September 2016 and May 2017. The results confirmed the presence of three species of primates, Cebus yuracus, Leontocebus nigricollis, and Lagothrix lagothrica poeppigii, through observation. direct, and other species such as Aotus sp. and Cebuella pygmaea were reported in interviews with the community. Although the low rate of sightings of primates does not seem to be related to a high intensity of hunting today, this could be due to their sensitivity to human activities such as noise or selective felling of trees by Kichwa communities in the buffer zone or Historical hunting in the past. The present study establishes the bases to elaborate effective action plans that help the sustainable use of the resources in the buffer zones and conservation plans of the primate species in the protected area that improve the state of their conservation.

Estimating biomass stocks and potential loss of biomass carbon through clear-felling of rubber plantations

When latex production declines after 35–40 y, clear-felling of rubber (Hevea brasiliensis) plantations is a common management practice around the world. Although clear-felling can lead to significant losses in system carbon (C), such losses have not been adequately quantified in rubber plantations in India. The objectives of this work are to (1) develop and test models for estimating rubber tree biomass and C storage in situations where diameter at breast height (D 1.3 m) cannot be measured precisely due to the tapping artefact, and (2) estimate losses in biomass C due to clear-felling of mature plantation. Five biomass estimation models were tested using a total of 54 trees destructively sampled from 35 to 40 y old plantations in North East India. Then the amount of biomass and the potential C losses following clear-felling were estimated. The tree biomass predicted by our models was within 0.2 and 5% of our measured tree biomass. The mean biomass was estimated at 376.9 and 23.9 kg per tree for above and below ground parts, respectively. On an area basis, total tree biomass was estimated at 286.1 Mg ha−1, which was more than that under jungle rubber (147 Mg ha−1) but lower than the forests (384 Mg ha−1) in the tropical regions. According to our estimate clear-felling of mature plantation can on an average remove C at a rate of 135 Mg ha−1, which represents most of the C stored in aboveground tree biomass. In order to conserve the biomass C and to maintain environmental integrity, we recommend selective felling of 20% of total growing stock starting from plantation age of 35 years and replanting at two year cycle.

Forest management strategy affects saproxylic beetle assemblages: A comparison of even and uneven-aged silviculture using direct and indirect sampling.

Management of forest for wood production has altered ecosystem structures and processes and led to habitat loss and species extinctions, worldwide. Deadwood is a key resource supporting forest biodiversity, and commonly declines following forest management. However, different forest management methods affect dead wood differently. For example, uneven-aged silviculture maintains an age-stratified forest with ongoing dead wood production, while even-aged silviculture breaks forest continuity, leading to long periods without large trees. We asked how deadwood-dependent beetles respond to different silvicultural practices and if their responses depend on deadwood volume, and beetles preference for decay stages of deadwood. We compared beetle assemblages in five boreal forest types with different management strategies: clearcutting and thinning (both representing even-aged silviculture), selective felling (representing uneven-aged silviculture), reference and old growth forest (both uneven-aged controls without a recent history [~50 years] of management, but the latter with high conservation values). We collected beetles using window traps and by sieving the bark from experimental logs (bolts). Beetle assemblages on clear-cuts differed from all other stand types, regardless of trapping method or decay stage preference. Thinning differed from reference stands, indicating incomplete recovery after clear-cutting, while selective felling differed only from clear-cuts. In contrast to our predictions, early and late successional species responded similarly to different silvicultural practices. However, there were indications of marginal assemblage differences both between thinned stands and selective felling and between thinned and old growth stands (p = 0.10). The stand volume of early decay stage wood influenced assemblage composition of early, but not late successional species. Uneven-aged silviculture maintained species assemblages similar to those of the reference and old growth stands and might therefore be a better management option when considering biodiversity conservation.

THE SPREAD OF DISEASES IN VOLYN REGION FORESTS

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.) Quel. 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.