DIGITALNA ARHIVA ŠUMARSKOG LISTA
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| ŠUMARSKI LIST 11-12/2003 str. 33 <-- 33 --> PDF |
M. Idžojtić, R. Pernar, Ž. Kauzlarić, M. Abramović. D. Janković, M. Pleše: INTENZITET ZARAZE ... Šumarski list br. II 12. CXXVII {2003). 545-33^ and Skrad (49 %), whereas in the forest office Delnice a little more than a half (52 %) of the examined trees is infested with mistletoe. The highest percentage of infested trees was found in the forest office Vrbovsko (63 %). In more favorable living conditions for silver fir trees mistletoe would be a part ofbiocenosis, and its presence would not represent a special problem to the host. According to the present state of distribution and intensity of infestation mistletoe can be considered one of the unfavorable biotic factors for silver fir trees. Based on the distribution of infested and non-infested fir trees in degrees of damage from 0 (healthy trees) to 4 (dead trees) it was noted that mistletoe appears on physiologically weakened trees. The more mistletoe bushes there are on a tree, the more stress there is for the host tree under its influence due to lack of water; the tree weakens additionally under the influence of a combination of other unfavorable factors, it becomes non-resistant to secondary parasites and illnesses, and it can even die. The fact is important that with the increase of infestation intensity in an area, there is the trend of mistletoe spreading on less damaged silver fir trees, and it can be presumed that these trees will be in a greater degree of damage in the near future. Key words: Viscum albums, ssp. abietis (Wiesb.) Abrom., Abies alba Mill., intensity of infestation, degree of damage, Croatian Forests Co. Ltd., Forest Administration Delnice 559 |