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Znanstveno-stručno i staleško glasilo
Hrvatskoga šumarskoga društva
Journal of Forestry Society of Croatia
      Prvi puta izašao 1877. godine i neprekidno izlazi do današnjeg dana
   ISSN No.: 0373-1332              UDC 630* upute autorima     povijest    digitalizacija
WEB EDITION
ARHIVA ČASOPISA


HRČAK


 
EDITORIAL
     
UREDNIŠTVO
IS THE FOREST ACT BINDING FOR ALL FOREST OWNERS?     pdf     HR     EN 5
 
ORIGINAL SCIENTIFIC PAPERS
     
Igor ANIĆ, Stjepan MIKAC, Mladen OGNJENOVIĆ UDK 630* 568 + 815 (001)
SELECTION OF TREE SPECIES FOR THE SUBSTITUTION OF POPLAR PLANTATIONS ALONG THE RIVER DRAVA NEAR OSIJEK     pdf     HR     EN 7
Igor POLJAK, Marilena IDŽOJTIĆ, Irena ŠAPIĆ, Patrik KORIJAN, Joso VUKELIĆ UDK 630* 181.8 + 164 (001)
DIVERSITY AND STRUCTURE OF CROATIAN CONTINENTAL AND ALPINE-DINARIC POPULATIONS OF GREY ALDER (Alnus incana /L./ Moench subsp. incana): ISOLATION BY DISTANCE AND ENVIRONMENT EXPLAINS PHENOTYPIC DIVERGENCE     pdf     HR     EN 19
Martin BOBINAC, Siniša ANDRAŠEV, Andrijana BAUER-ŽIVKOVIĆ, Nikola ŠUŠIĆ UDK 630*242 (001)
EFFECTS OF HEAVY THINNINGS ON THE INCREMENT AND STABILITY OF A NORWAY SPRUCE STAND AND ITS TREES BETWEEN THE AGES OF 32 AND 50     pdf     HR     EN 33
Bratislav MATOVIĆ, Miloš KOPRIVICA, Bratislav KISIN, Dejan STOJANOVIĆ, Igor KNEGINJIĆ, Stefan STJEPANOVIĆ UDK* 228 + 653 (001)
COMPARISON OF STAND STRUCTURE IN MANAGED AND VIRGIN EUROPEAN BEECH FORESTS IN SERBIA     pdf     HR     EN 47
 
PRELIMINARY COMMUNICATION
     
Milan PERNEK UDK 630* 453
NEW CALCULATION OF CRITICAL NUMBER OF GYPSY MOTH (Lymantria dispar L.) EGG MASSES FOR BETTER POPULATION DENSITY PROGNOSIS     pdf     HR     EN 59
Summary
Gypsy moth, Lymantria dispar was the dominat oak forest pest in Croatia untill 1960s. After this period population particularly in the continental part decreased with cyclical outbreaks every 10-11 years. Last two outbreaks occurred in 2003-2005, and in 2013-2014. In this study a new calculation of critical number of gypsy moth egg masses has been presented in order to estimate the risk of defoliation which is crucial for the decision about application of necessary control measures. The calculation shows critical numbers as number of egg mases per ha which differ from the previous calculations based on number of trees which carry at least 1 egg mass shown in percentages. Hitherto 5 Classes were known out of which the 5th was critical. This Class presented 50% of trees which carry at least 1 egg mas and it was assessed as critical. In such calculation the age of the trees was not taken in account although the amount of leaves in the canopy strongly depend on that. Furthermore the number of eggs in the egg masses was also ignored. New calculation is based on numbers of caterpillars which have the potential to defoliate an oak tree of different ages, obtained from literature. The average number of eggs in one egg mass was calculated out of 50 sampled and analysed egg masses. This data together with the normal distribution of oak trees per ha build the basis for the formula. Based on that 3 Categories were formulated which show the potential for defoliation and help to make the decision for applying control measures: Category I – control measures needed; Category II – control measures needed only if there is a special reason; Category III – no control measures needed. Critical numbers of old and new calculation have been compared in years of outbreaks. Results between new and old calculation show 25% difference which directly means 25% less area that needs treatment with insecticides. Although the new method has advantages there is still some limitation in the calculation considering that important variables are ignored. The real number of trees per ha and the actual number of intact caterpillars should be used for more accurate calculation and further reduction of forest area that needs protection.
Future research should concentrate on precise calculations of leaf weight consumed by average caterpillar in the relationship to crown volume both for oak and common beech. These values in combination with the number of leaves in the particular forest would make the decisions on use of insecticides more accurate which would bring additional substantial financial savings.

Key words: population dynamics; pest control; pedunculate oak; Quercus robur
Luka RUMORA, Mario Miler, Damir MEDAK UDK 630* 587
IMAGE FUSION INFLUENCE ON FOREST AREA CHANGE USING UNSUPERVISED CLASSIFICATION     pdf     HR     EN 67
 
REVIEWS
     
Carlos G. ROSSA, Paulo M. FERNANDES UDK 630* 148.2 + 111.8
ON THE FIRE-SPREAD RATE INFLUENCE OF SOME FUEL BED PARAMETERS DERIVED FROM ROTHERMEL’S MODEL THERMAL ENERGY BALANCE     pdf     HR     EN 77

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