broj: 5-6/2005        pdf (29,9 MB)



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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* https://doi.org/10.31298/sl
upute autorima
WEB EDITION
ARHIVA ČASOPISA


HRČAK


 
ORIGINAL SCIENTIFIC PAPERS
     
Orlić, S., S. Perić UDK 630* 232.1 (001)
Study of Growth of Douglas Fir Provenances (Pseudotsuga menziesii (Mirb.) Franco) on Krndija     pdf     HR     EN 243
Križanec, R. UDK 630* 228 + 561 (001)
Transition Time as an Indicator of Changes in the Development of Forest Stands of Selection Silvicultural Form     pdf     HR     EN 251
Pernek, M., I. Pilaš UDK 630* 453 (001)
Gradations of Gypsy Moth - Lymantria dispar L. (Lep., Lymantriidae) in Croatia     pdf     HR     EN 263
SUMMARY: Gypsy moth – Lymantria dispar L. (Lep., Lymantriidae) represents
one of the most significant pest on oak in Croatia. As a defoliator it
was known as early 18th century, when the first total defoliation on larger
areas were recordet. Investigation of Klepac and Spaić (1965) showed that
the lose of the increment of pedunculate oak amount 30 % which means enormous
financial loses. The severe gradations of gypsy moth in the last century
occured in the continental part of Croatia 1948–1950, 1962–1966,
1970–1975, 1982–1984 and 1992–1994. While the gradation in the mediterian
part has been increased in the continental part they droped. For the
good forest protection work it is very importend to have good prognosis. The
aim of this paper is to show how a easy statistical analysis can be used for this
purpose.

During the last 30 years Gypsy Moth has been intensively monitored and
the data have been sent to the Diagnostic-Prognostic Centre (DPC) placed in
the Forestry Research Institute Jastrebarsko. Counting of every founded egg
masses on a line trough a oak forest receivse the intensity of attack. Five
diffrent classes of attack are differentiated: < 1 % (Class 1); 1-5 % (Class 2);
5-20 % (Class 3), 20-50 % (Class 4), > 50 % (Class 5).

For the satistical analysis we use the method of moving average and spectral
analysis (Statsoft Statistica ® 5.5). The results shows that the trend for
Class 1 and Class 2 is positiv, but negative for Classes 3, 4 and 5. The spectral
analysis using Fast Furier Method confirmed that weak attacks occur
every 8 years, while more severe attacks every 10 years.

Operational data indicate that the intensification of attacks can be expected
in 2005 but in weaker intensity than 10 years ago. The reason for that phenomenon
should be disscused. The last gypsy moth gradation has been fight
whit insecticides but the same were be done whit other pest so it couldn´t be
the reason for the weaker intensity. Climatic changes could be the most serious
reason.
Key words: gypsy moth; Lymantria dispar; population; pedunculate oak; Quercus robur; Fast Furier method; Moving average
 
PRELIMINARY COMMUNICATION
     
Kajba, D., I. Anić, D. Pfeifer UDK 630* 165 (Populus nigra L.)
Sustainability and Conservation of Genetic Resources with a Focus on the European Black Poplar (Populus Nigra L.)     pdf     HR     EN 271
 
REVIEWS
     
Meštrić, B. UDK 630* 945.1
Forestry Journal - Bibliographic Database and Its Presentation     pdf     HR     EN 279
Šporčić, M. UDK 630* 641
Insight Into Some Aspects of Entrepreneurship in the European Forestry     pdf     HR     EN 287

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