Hlasny T.,Slovakian Forest Research Institute |
Hlasny T.,Czech University of Life Sciences |
Trombik J.,Czech University of Life Sciences |
Holusa J.,Czech University of Life Sciences |
And 10 more authors.
Journal of Pest Science | Year: 2015
The gypsy moth is the most important defoliator of broadleaved forests in the Northern Hemisphere. We explored the patterns in the moth’s long-term dynamics and produced outbreak forecasts for seven countries located in central to southeastern Europe and extending into the Carpathian Mountains. We investigated how the outbreak periods and trends in the size of outbreak areas differ among the countries, the extent to which pest dynamics are synchronized, and how the observed patterns can be used to forecast outbreaks. We used long-term time series on outbreaks from about 1947 to 2013. The outbreak period ranged from 13 years in the northwest to 8 years in the southeast of the region; the periods were statistically significant in six of the seven countries (α = 0.05). Two distinct patterns in outbreak size were observed, i.e. while outbreak areas in the northwest were increasing, exceptionally large outbreaks occasionally occurred in the southeastern part of the region. Outbreak forecasts based on combined use of the Fourier Transform and ARFIMA approaches showed that outbreak predictability differs among the countries. An increase in outbreak areas, the control of which would require increased resources, was forecasted mainly in the central part of the region. Although the forecasts can support the forest management, there are limits to their use because of the complex relationships between the pest and the environment, which were not captured by our empirical forecasting models. © 2015 Springer-Verlag Berlin Heidelberg
Tkaczyk M.,Forest Research Institute |
Sikora K.,Forest Research Institute |
Nowakowska J.A.,Forest Research Institute |
Anisko E.,Forest Research Institute |
And 3 more authors.
Folia Forestalia Polonica, Series A | Year: 2016
To investigate susceptibility of young Scots pine seedlings to four Phytophthora species: Phytophthora cactorum, Phytophthora cambivora, Phytophthora plurivora and Phytophthora pini; seven-day-old seedlings of Scots pine (15 seedlings per experiment) were infected using agar plugs of the respective species. Control group also consisted of 15 seedlings and was inoculated with sterile agar plugs. Results unambiguously show that after 4.5 days, all seedlings show clear signs of infection and display severe symptoms of tissue damage and necrosis. Moreover, three and two seedlings in the P. cactorum and P. cambivora infected seedlings groups, respectively, collapsed. The length of largest necrosis measured 13.4±3.90 mm and was caused by P. cactorum. To rule out any putative contamination or infection by secondary pathogens, re-isolations of pathogens from infection sites were performed and were positive in 100% of plated pieces of infected seedlings. All re-isolations were, however, negative in the case of the control group. Detailed microscopic analyses of infected tissues of young seedlings confirmed the presence of numerous Phytophthora species inside and on the surface of infected seedlings. Therefore, our results suggest Phytophthora spp. and mainly P. cactorum and P. cambivora as aggressive pathogens of Scots pine seedlings and highlight a putative involvement of these species in the damping off of young Scots pine seedlings frequently observed in forest nurseries. © 2016 by the Committee on Forestry Sciences and Wood Technology of the Polish Academy of Sciences and the Forest Research Institute in Śkocin Stary.
Tabakovic-Tosic M.,Institute of Forestry Belgrade |
Tosic D.,University of Belgrade |
Rajkovic S.,Institute of Forestry Belgrade |
Golubovic-Curguz V.,Institute of Forestry Belgrade |
Rakonjac L.,Institute of Forestry Belgrade
African Journal of Agricultural Research | Year: 2011
Coleophora laricella Hübner, 1817 was introduced in Serbia along with Larix decidua Miller, 1768 (commonly used in the recultivation processes by reforestation) and as a result of the great adaptive ability, it was well-adapted to the site conditions, which differed greatly from the ones within the limits of its nature spread. It is very obstinate and harmful forest insect. In suitable places it has a permanent fluctuation, and in artificial stands the outbreak can last for as long as 12 years, which was confirmed in the common larch cultures established in 1981 at the waste disposal sites of the waste-rock of energyindustrial complex Kolubara, where it started in 1992 and lasted for 15 years. The chemical aerial suppression was conducted in 1996, and the success was complete, but short-lived. However, in the subsequent years, until 2007, the number of the larch casebearer was still above the critical one. The parasitic complex (10 species) was not sufficient for the significant reduction of the population level of the host. The multi-annual consecutive defoliation caused the significant reduction of the current and total increment of the common larch trees, as well as the increase of the intensity of their desiccation. © 2011 Academic Journals.
Stankovic D.,University of Belgrade |
Nikolic M.S.,University of Belgrade |
Vilotic D.,University of Belgrade |
Ivetic V.,University of Belgrade |
And 2 more authors.
Fresenius Environmental Bulletin | Year: 2015
This paper analyzes the iron (Fe) content of the vegetation at the beginning of the vegetative cycle for the period 2012/2013. Heavy metal content in the vegetative parts of ten plants (eight types of woody plants and two types of herbs) was analyzed in four locations. Iron (Fe) is a biogenic element present in plants in relatively small quantities. However, its ability to produce chelates, as well as being polyvalent, assorts it into a group of elements which have a significant impact on many physiological and biochemical processes. The analysis of iron content in leaves of woody plants and herbs growing in the natural protected area "Kosmaj" has shown that depending on location the iron concentration, in statistical terms, significantly differs and ranges from A to I in locations 1 and 3, whereas its concentration ranges from A to J in locations 2 and 4. © by PSP.
Popovic V.,Institute of Forestry Belgrade |
Rakonjac L.,Institute of Forestry Belgrade |
Cirkovic-Mitrovic T.,Institute of Forestry Belgrade |
Lavadinovic V.,Institute of Forestry Belgrade |
Lucic A.,Institute of Forestry Belgrade
Silva Balcanica | Year: 2014
In this paper are presented research results on the effect of container type on growth and morphological parameters of Bald cypress (Taxodium distichum (L.) Rich.) seedlings that origin from different trees. In experiment were used two types of containers Bosnaplast 18 and Bosnaplast 12, and seeds were collected from five parent trees. Seedlings produced in containers type Bosnaplast 18 with cell volume of 220 cm3 have larger dimensions and they are more quality than seedlings produced in containers type Bosnaplast 12 that have cell volume of 120 cm3. Studies have shown that container volume has positive effect on morphological characteristics of Bald cypress seedlings in conditions of seedling nursery.