DIGITALNA ARHIVA ŠUMARSKOG LISTA
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| ŠUMARSKI LIST 1-2/1981 str. 64 <-- 64 --> PDF |
8. Spai ć I.: Neka ekološka opažanja i rezultati suzbijanja moljca jelinih iglica (Argyresthia fundella F. R.), Sum. list br. 5—6, 1968. 9. Vajd a Z.: Moljac jelovih iglica u sastojinama Gorskog Kotara, šum. list 9, 10, 1954. New Knowledge on the Morphology and Biology of Fir Needle Moth Argyresthia fundela F. R. (Lepidoptera: Tineidae) Summary While investigating the population dinamics of Argyresthia fundella F. R. ihe author has found that without knowledge on some fundamental biological and morphological characteristics of this insect, further progress is not possible. Therefore, the author has made some thorough investigations with the following purpose: to find the place where A. fundella lays eggs, morphological shape and the size of the eggs, biotic potential of the species, the duration of embrional development method of drilling into needle and other bio-ecological characteristics related to it. The results of this investigation have shown that A. fundella F. R. lays her eggs on the sprout and not on the needle as some earlier authors thought. According to this preliminary observations and measurement the egg is circular to oval in shape, 0,04 — 0,05 mm in length, 0,2 — 0,03 mm in width. It is bossy on the upper sider with irregular pentagonal sculptures of the honey-comb shape. Lower side is completely flat. Colour of the egg is yellow-orange. The eggs are laid individually on one-and-two years old sprouts. The female lays between 18 and 20 eggs in total. The duration of developement is betwen 15 and 34 days depending on the climate conditions. For forcasting purposes tne authors has also investigated the nutritional status of the Fir-tree by the method of foliar analysis. The nutritious substances content obtained by the analiyss. The nutritious substances´ content obtained by the analysis of needles is closeliy related to the moth´s presence and to the intensity of its attack respectively. The author also points out a certain coincidence between the percentage of the sugar (primarily sacchorose) in the needles and the atack intensity of the moth on the various localities in Gorski kotar. The author believes that he has solved a lot of dilemmas related to A. fundella F. R. and that he has given a certain contribution to successful fight of this S. R. Croatia´s characteristics pest. |