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Publications 2007
Department of
forest biodiversity, planning and expertise
Tvauri L., Svanidze M., Rostiashvili S. - Peculiarities of vertical shaped yew coppices in Batsara ravine (Vasil Gulisashvili Forest Institute). Collection of Scientific Works "Problems of Agrarian Sciences", volume 38. Summary Vertical layerage of coppices of yew and mixed with beech trees is considered in the article. It has been determined that pure one-layer yew coppices are not found at all. Yew and mixed with beech coppices are mainly characterized by two-layer and three-layer vertical shape. Urushadze A., Tvauri I., Pasurashvili N. - Structure of yew stands depending on soil conditions in Batsara ravine. "News of Agrarian Science", Publishing House "Universal", Tbilisi. (in Russian) Summery Questions of regularity of tree distribution by height stages and thickness are considered in the article. Some separate bio groups of yew stands are studied. It has been determined that maximal number of yew trees is located in the limits of 25-27 m of height stages and in the limits of 56-60 cm thickness stages. With increasing of height steps number of trees increases too, reaching certain maximum which is subjected to the law of normal distribution of stand. Brown forest soils under stands, where majority is yew and which by their general stock of nutrient elements are characterized by rather high fertility have been studied. Tvauri I., Okrostsvaridze T. - Some peculiarities of morphological-anatomical structure of needles of yew (Taxus Baccata L.) and Caucasian Fir (Abies nordmanniana Stev.) (Vasil Gulisashvili Forest Institute). Collection of Scientific Works "Problems of Agrarian Science", 2007, volume 38, pp. 126-129. Summary Indices of morphological-anatomical structure of needles of different light and shadow types of yew and Caucasian Fir (abies) has been analyzed, where resemblance and difference of anatomical structure of needles of this wood species are singled out. Tvauri I., Okrostsvaridze T. - Morphological-anatomical peculiarity of formation of assimilative biomass of mountainous oak-tree forests. Collection of Scientific Works "Problems of Agrarian Science", volume 39. Summary Morphological structure of assimilative biomass (leaves) and anatomical structure of leaves of light and shadow types in the vertical profile of the trees of mountainous oak coppices of same age and of (0,4-0,6) density are considered in the article. It has been determined that among oak-tree species existent in Georgia, leaves of mountainous oak are marked out by their special xceromorphic structural texture. Nakaidze E., Vachnadze G., Tsereteli G. - Peculiarities of soil micro flora of hornbeam and oak-hornbeam groves. Collection of Scientific Works "Problems of Agrarian Science", volume 40. Summary Exchange of substances and energy in soil is accomplished by means of micro flora. Microorganisms ensure feeding of roots in highest plants for the purpose of mineralizing of organic substances. Hornbeam, oak, beech, alder and other deciduous species positively act and enrich the soil with soft humus (Mull), nitrogen, ash elements, provide the neutralization of soil acidity. All these create favorable conditions for development of micro flora in soil. In this case, influence of organic dropping of hornbeam and oak, mass and the degree of their mineralization upon soil micro flora, upon its species contents and activity is very interesting. Vachnadze G., Kharaishvili I., Tsereteli G. - Evaluation of recreation functions of oak-hornbeam groves in green zone around Tbilisi. Collection of Scientific Works "Problems of Agrarian Science", volume 40. Summary Recreation functions of oak and hornbeam coppices in Didgori experimental-model forestry have been studied. Degree of their sustainability and validity has been evaluated. Radiation and effective temperatures, usable for recreation purposes have been defined. Daily, permissible, limited norms of loading in forest biogeocenosis for moist and dry forest types have been determined. Dolidze L., Nakaidze E. - Influence of forest cover on soil micro flora and water peculiarities in beech coppices after cutting. Collection of Scientific Works "Problems of Agrarian Science", volume 40, Tbilisi. Summary Influence of forest cover upon water peculiarities and micro flora of soil has been considered. It has been determined that asystemic cuttings negatively act on the processes of keeping and distribution of precipitation by forest slope, which assist origin of erosion and surface dranaige processes. Cuttings in beech forests cause significant transformation of soil micro flora, damage of soil cover and changes of biological processes. Gotsiridze R. - Regularity of interdependency of timber energy of pine annual growth. Publishing house "Gulani", Tbilisi. (Monograph) Summary In the inter-time-space of annual tree growth different types of energy existing independently from definite quantities synchronously move and act, which by necessary interdependent equal existence create unity of annual growth of tree. Lobjanidze E. - Cambium activity of maple tree, anatomical structure and peculiarities of wood. Collection of Scientific Works "Problems of Agrarian Sciences", volume 38, Tbilisi. Summary It has been determined that average duration of cambium activity in vegetative period composes 120-125 days; average width of annual rings of wood formed during this period is 1,2-1,5 mm, and of later wood contents in annual rings is 35-40%. Burdjanadze M., Kakhadze M., Supatashvili A., Nakaidze E. - Testing of vertimec against gipsy moth in Eastern Georgia. Inter. Scientific Meeting on topic "Modern Problems of Biological Protection of Forests in the Black Sea Regions and Nearby Territories", Sochi, Russia. (in: Russian) Summary In 2005 in Dusheti and Kaspi districts in deciduous forests nidus of gipsy moth were revealed. Efficiency of new generation preparation "Veptimec" on caterpillar of gypsy moth of II-III-IV ages was defined. 0,1 % suspension of "Vertimec" is singled out by its high efficiency. On the seventh day mortality of caterpillars in laboratory reaches 95%. Fatal concentration of this preparation which composes CK50=0,04% and where B.E. is equal of 90,5 % has been determined. Lobjanidze E. - Colchetian box tree (boxus colchica Pojark) (in: World of wood Journal, volume 60, num. 2, U.S.A). (in English) Summary On the wood similar to bone, which exploitation sizes reaches during 400-500 years. Because of depletion of this species is at the edge of disappearance, as its wood was intended for export, it was sold by weight and its cost was equal of silver cost. In accordance with literary information in 1883-87, on average about 2340 ton of box tree was exported from the Black Sea ports, in the result of which this unique species entirely disappeared in some regions. It is brought in "Red Books" of the former Soviet Union and Georgia, is protected by law. Department of
forest rehabilitation and forest melioration
Okrostsvaridze T. (co-author Tvauri I.) - Morphological-anatomical peculiarity of formation of assimilative biomass of mountainous oak-tree forests. Collection of Scientific Works "Problems of Agrarian Science", volume 39. Summary Morphological structure of assimilative biomass (leaves) and anatomical structure of leaves of light and shadow types in the vertical profile of the trees of mountainous oak coppices of same age and of (0,4-0,6) density are considered in the article. It has been determined that among oak-tree species existent in Georgia, leaves of mountainous oak are marked out by their special xceromorphic structural texture. Pasurashvili N. (co-authors - Urushadze A., Tvauri I.) - Structure of yew stands depending on soil conditions in Batsara ravine. "News of Agrarian Science", Publishing House "Universal", Tbilisi). (in Russian) Summery Questions of regularity of tree distribution by stages of height and thickness are considered in the article. Some separate bio groups of yew stands are studied. It has been determined that maximal number of yew trees is located in the limits of 25-27 m of height stages and in the limits of 56-60 cm thickness stages. With increasing of height steps number of trees increases too, reaching certain maximum which is subjected to the law of normal distribution of stand. Department of
forest protection
Kereselidze,
M., Wegensteiner, R., Goginashvili N.& Tvaradze M..2007. Natural enemies of Ips typographus L.( Summary The occurrence of pathogens in Ips typographus L.
populations from Picea orientalis stands in Georgia was investigated. In
total 254 beetles (119 male, 94 female and 41 not identified) were dissected
from three different sampling plots. The frequency of pathogen species varied
depending on location. Gregarina typographi, Chytridiopsis typographi, Fusarium sp, Contortylenchus diplogaster,Tomicobia
seitneri were retrieved from different locations. Goginashvili, N., Kereselidze M. 2007. Efficiency of different bacterial preparations
against the Fall webworm (Hyphantria
cunea Drury) in Georgia “Alien Arthropods in South East Europe-crossroad
of three continents” (AASEE)
Theses of Intern. Conference. Sofia, Bulgaria.45 Summary Different bacterial preparations were
examined against the serious deciduous plant defoliator Americal fall webworm - Hyphantria cunea Drury which is widely spread in the Kereselidze, M., Wegensteiner,R. 2007. Occurrence of pathogens and parasites in Ips typographus L. from spruce stands (Picea orientalis L.) in Summary Occurrence of pathogens was investigated in the spruce bark beetle Ips typographus from two different sampling plots in Borjomi region at 900m above sea level, collected in 2004. Investigation brought evidence of one pathogen species only, GGregarina typographi, was found in the mid-gut lumen of 48,6% and of 23,2% of adult beetles respectively. In both cases were more male beetles infected than female beetles. Furthermore, unidentified fungal infections were observed in some few individuals. Relatively few beetles had larvae of the Hymenopteran parasitoids Tomicobia seitneri and Ropalophorus clavicornis. In addition, Contortylenchus typographi nematodes were found in the haemolymph of beetles, and not identified nematode larvae in the gut lumen. Supatashvili A. - Action of different factors on mortality of ash-tree Eupareophora exarmata Thoms. (Hymenoptera: Tenthredinidae) in conditions of Georgia. International symposium "Present Day Problems of Biological Protection of Forests in The Black Sea Region and on Nearby Territories", Pushkino, Moscow district, information bulletin N 38. Summary We have studied a very interesting pest - Eupareophora exarmata Thoms., which is ash-tree monophage. It was first found in the 70-ies of twentieth century in Georgia for the former Soviet Union entomofauna. Pest biology has been studied and presented with its phenocalendar. Observations are carried out in nature on the mortality of different phases (egg, worm, larva, imago) of pest, caused by natural factors. Complex of parasite insects is revealed: Cubocephalus anatorius Grav., Gelis cf. costalis Thoms., G. ivfumatus Thoms. and Eurotoma verticillata F., but mortality caused by bacteria and virulent pathogens was less. Chkhoidze M., Kobachidze L. - On morpho-physiological investigation of oak-tree (Tortrix viridana L.) in forests of Shida Kartli. "Moambe of Georgian Agricultural Scientific Academy", volume 19. Summary Results of visual and hematological monitoring in forests of Shida Kartli
are presented. Investigations confirmed that hematological method expresses
physiological condition of population of oak (Tortrix viridana L.). Due to
this method exact picture of pathological condition of pest gives us
possibility of defining their expectable terms of mass reproduction in
advance, which helps us to plan corresponding measures for regulating pest
quantity on time. |
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