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Search Results: 1 - 10 of 848 matches for " Milanovi? Slobodan "
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Preference and performance of the gypsy moth cater-pillars on sweet chestnut and some oak species
Glasnik ?umarskog Fakulteta , 2010, DOI: 10.2298/gsf1001113m
Abstract: In the establishment of mixed plantations, it is necessary to examine previously the relations of the principal and the admixed species and the most significant pests. This paper presents the results of the study of the gypsy moth caterpillar preference and performance on sweet chestnut and four oak species. Preference index is the highest for Hungarian oak (0.83) and Turkey oak (0.77), for sessile oak it is significantly lower (0.33), and for common oak it is equal to 0. In combination with sweet chestnut, the gypsy moth second-instar caterpillars prefer Hungarian oak, i.e. Turkey oak leaves. In combination with sessile oak or common oak, the gypsy moth caterpillars prefer sweet chestnut leaves. The analyzed parameters which characterise the performance of the gypsy moth fourth-instar caterpillars are lower for all study oak species compared to sweet chestnut, except in the case of Turkey oak. Based on the study results and the adopted principle that the mixture should be composed of the most favourable species, which will serve as the 'trap plant' during the gypsy moth outbreak, it can be concluded that Turkey oak is more favourable for the mixture with sweet chestnut than the other analyzed oak species.
Development of gypsy moth (Lymantria dispar L) on the foliage of Quercus cerris L., Q. Petraea (matt) Liebl. and Q. Robur L. in the controlled conditions
Glasnik ?umarskog Fakulteta , 2007, DOI: 10.2298/gsf0796055m
Abstract: The development of Gypsy moth (Lymantria dispar L) was monitored in laboratory conditions, on the foliage of the species Quercus cerris L. Quercus petraea (Matt) Liebl. and Quercus robur L. The experiment was established in the controlled environmental conditions, at the temperature of 25°C, photoperiod 14:10 (day: night) and relative humidity 70%. The objective of the research was to determine the suitability of the study host plant species for gypsy moth development. The study results show that Gypsy moth caterpillars cultivated on Q. petraea foliage had a lower survival, higher number of moultings, longer preadult development and lower fecundity, which makes this species less suitable compared to the other two. Gypsy moth caterpillars cultivated on Q. cerris foliage had the highest survival degree the lowest number of moultings, the shortest preadult development and the highest fecundity, which makes this species the most favourable for gypsy moth development. Q. robur was between the former two species in this respect.
Host plant effect on the susceptibility of gypsy moth caterpillars to insecticides
Glasnik ?umarskog Fakulteta , 2002, DOI: 10.2298/gsf0285069m
Abstract: Gypsy moth (Lymantria dispar L) is the most significant pest of broadleaf forests. The dynamics of gypsy moth population depends on several biotic and abiotic factors, but it is also highly dependent on the quality of consumed food. The gypsy moth control increasingly relies on the biological preparations based on Bacillus thuringiensis subspec. kurstaki (Btk) and Lymantria dispar Nuclear Poliedrosis virus (NPV). Chemical preparations are still applied although more rarely, the pyrethroids which include also lambda-cyhalothrin This paper presents the study results of the effect of host plant on gypsy moth caterpillar (Lymantria dispar L) susceptibility to lambda cihalotrine insecticide, by which the study oak leaves were contaminated. The study results show the lowest mortality of the caterpillars fed on contaminated leaves of Turkey oak (17.5%), then pedunculate oak (86.1%), and the highest mortality of caterpillars fed on sessile oak leaves (92%). The rate of the gypsy moth caterpillar development depends on the host plant Susceptibility of the gypsy moth caterpillars to the above preparation depends on the host plant The knowledge of the effect of host plant on insecticide efficiency in gypsy moth suppression would render insecticide utilisation optimal.
Host plant effect on the number of moultings and head capsule width of the gypsy moth caterpillars
MilanoviSlobodan,Milanovi? Sla?an
Glasnik ?umarskog Fakulteta , 2012, DOI: 10.2298/gsf1205127m
Abstract: The effect of four oak species: Turkey oak, Hungarian oak, sessile oak and English oak on the number of moultings and head capsule width of the gypsy moth caterpillars was researched. Host plants have a statistically significant effect on the number of both male and female larval instars. The highest number of larval instars was recorded for caterpillars fed on sessile oak leaves, and the lowest number was recorded for those fed on Turkey oak leaves. Females reared on Hungarian oak and English oak leaves had a normal number of larval instars. Except for 1st instar caterpillars, all other larval instars showed a statistically significant host plant effect on the head capsule width. The widest head capsules were found on caterpillars fed on Turkey oak leaves, and those fed on sessile oak leaves had the narrowest head capsules. The study data on head capsule widths can be practically applied in the determination of the optimal ratio of larval instars in the gypsy moth population, i.e. in the determination of terms for aerial spraying actions.
Influence of different oak species (Q. cerris L. and Q. robur L.) and environment conditions on the gypsy moth development
MilanoviSlobodan,Markovi? Nenad
Glasnik ?umarskog Fakulteta , 2005, DOI: 10.2298/gsf0592099m
Abstract: This paper presents the results of the laboratory study of gypsy moth development on Q. cerris and Q. robur foliage in controlled and uncontrolled environmental conditions. The survival is higher in controlled conditions than in uncontrolled conditions. In uncontrolled conditions, sex ratio is higher in individuals fed on pedunculate oak foliage (0.55) compared to those fed on Turkey oak foliage (0.39), while in the controlled conditions the situation is the opposite. The increase of in star number is greater in pedunculate oak than in Turkey oak. There is a statistically significant difference between the means of all the study characters (length of development of the first and the second instars, length of premarital development, number of instars and fecundity) in uncontrolled and controlled environmental conditions. Also, there is a statistically significant difference between the means of all the study characters on different oak species, except in fecundity. There is an interaction between environmental conditions and host plant species in the length of development of the first and the second instars, as well as in the number of instars during the development. The study results show that Turkey oak is more favorable for the gypsy moth development than pedunculate oak.
Gremmeniella abietina (Lagerb.) Morelet: Distribution in Serbia and Montenegro, significance and control
Karad?i? Dragan,MilanoviSlobodan
Glasnik ?umarskog Fakulteta , 2008, DOI: 10.2298/gsf0898107k
Abstract: Fungus G. abietina is one of the most dangerous pathogenic fungi occurring in conifer plantations and Pinus species are especially at risk. Among pines, the most susceptible species is Austrian pine, and particularly endangered plantations are between 8 and 25 years of age. This fungus was found in Serbia and Montenegro on Austrian pine, Scots pine and spruce, but it was only in mountainous regions (Kopaonik, Vlasina, Go , Durmitor). G. abietina forms both stages (anamorph and teleomorph) in its development. The imperfect form is far more significant for the infection process, i.e. the pycnidial stage and generally all infections are caused by conidia (pycnospores). Apothecia will be formed on the bark only two years after tree dying. In the severely infected plantations, all dead trees should be felled and removed, and the remaining trees should be treated with copper fungicides.
Effect of host plant on gypsy moth diet and biological efficacy of Btk preparations
MilanoviSlobodan,Tabakovi?-To?i? Mara,Markovi? Nenad
Glasnik ?umarskog Fakulteta , 2006, DOI: 10.2298/gsf0694197m
Abstract: The effect of two host plants, Turkey oak (Quercus cerris L) and black poplar (Populus nigra L) on gypsy moth (Lymantria dispar L) development was researched. The effect of host plant was determined based on the parameters which characterize the diet, growth and efficacy of conversion of ingested food of the third instar caterpillars. Along with the effect on development, the effect of host plant on the efficacy of biological preparation based on the bacterium Bacillus thuringiensis var. kurstaki in gypsy moth caterpillar suppression was also researched. The differences in parameters characterizing the diet, growth, and efficacy of ingested food between experimental groups of caterpillars grown on poplar and Turkey oak leaves are explained by the differences in the chemical composition of the leaves of these tree species. The efficacy of Btk preparation is conditioned by the mechanism and content of different groups of defense substances in the leaves of the applied tree species.
Interactions of polysporous cultures of antagonistic fungus Peneiphora gigantea (Fr.) Massee and some decay fungi of spruce from Stara planina
Lazarev Vladimir,Radulovi? Zlatan,MilanoviSlobodan
Glasnik ?umarskog Fakulteta , 2005, DOI: 10.2298/gsf0591163l
Abstract: In the control of the fungus Heterobasidion annosum the most frequently applied method is stump treatment with biological preparations containing dehydrated spores of the saprophytic fungus Phlebiopsis gigantea (syn. Peniophora gigantea /Fr./ Massee). In the field, this fungus is a competitor to the fungus Heterobasidion annosum. This paper presents the results of laboratory analyses of interactions of decay fungi isolated from the root and butt of uprooted spruce trees in the Nature Park "Stara Planina", and their relation to the fungus Ph. gigantea. The interactions of these fungi were analyzed at the temperatures of 20°C, 25°C and 30°C.
Host plant effect on the activity of digestive enzymes of the gypsy moth caterpillars
MilanoviSlobodan,Lazarevi? Jelica,Mrdakovi? Marija,Vlahovi? Milena
Glasnik ?umarskog Fakulteta , 2008, DOI: 10.2298/gsf0898127m
Abstract: Insect growth and development depend on nutritive value and secondary metabolite content of their host plants. This influence may be exerted through changing the activity of digestive enzymes which further affects efficiency of conversion of ingested food. This paper represents the results of investigation of feeding effects on the leaves of three oak species (Quercus cerris, Q. robur and Q. petraea) on growth, development and digestive enzyme activities of the 4th instar gypsy moth larvae (Lymantria dispar L.). Compared to larvae fed on Q. cerris and Q. robur leaves, larvae fed on Q. petrea exhibited the lowest body mass, midgut protein content and specific protease activity. Specific amylase activity was significantly reduced in the midguts of larvae fed on Q. robur while host plant did not affect larval duration upon molting into the 4th instar. Concomitant chemical analyses of leaves given to the 2nd and 4th instar larvae was carried out in order to explain the obtained results.
Photosynthetic efficiency of Pedunculate oak seedlings under simulated water stress
Popovi? Zorica,MilanoviSlobodan,Mileti? Zoran,Smiljani? Miroslava
Glasnik ?umarskog Fakulteta , 2010, DOI: 10.2298/gsf1001139p
Abstract: Photosynthetic performance of seedlings of Quercus robur exposed to short-term water stress in the laboratory conditions was assessed through the method of induced fluorometry. The substrate for seedlings was clayey loam, with the dominant texture fraction made of silt, followed by clay and fine sand, with total porosity 68.2%. Seedlings were separated in two groups: control (C) (soil water regime in pots was maintained at the level of field water capacity) and treated (water-stressed, WS) (soil water regime was maintained in the range of wilting point and lentocapillary capacity). The photosynthetic efficiency was 0.642±0.25 and 0.522±0.024 (WS and C, respectively), which was mostly due to transplantation disturbances and sporadic leaf chlorosis. During the experiment Fv/Fm decreased in both groups (0.551±0.0100 and 0.427±0.018 in C and WS, respectively). Our results showed significant differences between stressed and control group, in regard to both observed parameters (Fv/Fm and T ). Photosynthetic efficiency of pedunculate oak seedlings was significantly affected by short-term water stress, but to a lesser extent than by sufficient watering.
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