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ŠUMARSKI LIST 7-8/1960 str. 25     <-- 25 -->        PDF


Brau n R.: Insektenschäden an der Tanne im Wienerwald. Centralblatt für das

gesamte Forstwesen, Heft 7/8 i 10, Jahrgang 67, 1941.
Braun s A.: Beitrag zur Biologie der Tannennadelmotte Argyresthia fundella F. R.
No 12, 1952.

Escheric h K.: Forstinsektenkunde Mitteleuropas, Bd III.
Komare k J.: Forstentomologische und andere Beobachtungen über das Tannen

sterben in Böhmen, Mähren und Karpatenländern. Tharandter forstliches Jahr

buch, Heft 11/1.2, 1942.
Kovaèevi æ 2.: Primjenjena entomologija, III. knjiga Šumski štetnici, Zagreb 1956.
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nerwald und anderen Gebieten Österreichs. Centralblatt für das gesamte Forst

wesen 59. Heft 11, 1933.
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a. m. 106 Jahrgang, August 1930.
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Thus far the Fir needle moth {Argyresthia fundella F. R.) was considered in
Croatia an insignificant insect pest. In the last years it has multiplied to such numbers
in the area of the Fužine forest district (in Gorski Kotar) as to cause serious
damage to the forest economy. Owing to this insect pest a large number of Fir trees
have died back and have been felled — according to incomplete data — totalling a
volume of over 12.000 cu. m.

The favourable climatic conditions round Fužine — exposed to the influence of
Mediterranean climate, which in the last years has become warmer — has helped
multiplication of this insect pest.

The biological data on the Fir needle moth occurring in our regions are — some
small variations excepting — in harmony with those already known in literature.
In Gorski Kotar the built-up of the population (»gradation«) started already in 1950
and ended in 1957. During this period the infestation was spreading more and more,
occupying new forest stands every year. Intensively attacked were ca. 400 ha., the
whole of the area amounting to ca. 1000 ha. Above an altitute of 1000 m. Argyresthia
does not occur, which, too, proves that its occurrence is conditioned in the first place
by climatic conditions.

´Damages by the Fir needle moth manifest themselves in dying away of trees as
well as in the loss of increment. The loss of increment because of the poor capability
of Fir to regenerate the crown extends over several years. In Gorski Kotar it is still
felt to-day after 8 years. Some trees die back immediately, others vegetate for 8
years and more, dying back at last. The young growth of Fir too. suffers from attacks.
The Spruce is not endangered in spite of attacks on single needles during the culmination
of the pest outbreak. The attacked Fir trees bear no seeds. Thus there is a
risk of deforestation for the soil on a calcareous parent rock.

Experiments of control performed both in the forest and in the laboratory have
proved the Parathion E-605 to be effective against larvae in a concentration of 0.1—
O^/o. Metasystox has given good results in higher concentrations (0.3%>). Systox is
ineffective. Cold weather reduces the efficiency of all the mentioned preparations.
Owing to this as well as because of the inadequate potency of these insecticides
their use in the control is not recommended.

The control of butterflies can be carried out by means of the Swingfog apparatus
spraying DDT-preparations (Pantakan M-15^. The combating should be started
immediately after the emergence of the first butterfly, and then it is to be repeated
after 10 and 20 days respectively. For the beginning of the control one should consult
the entomologist who vill follow up the course of pupation as well as the emergence
of the butterfly, and on the basis of this he would determine the time of combating

The enormous losses caused by this inect nest to our coniferous forest resources
will justify the expenses to be sustained in the control.