DIGITALNA ARHIVA ŠUMARSKOG LISTA
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ŠUMARSKI LIST 3-4/2006 str. 29     <-- 29 -->        PDF

M. Idžojtić, M. Glavaš, M. Zebec, R. Pernar, B. Bradić, D. Husak: ŽUTA IMELA (Loranthus europaeus Jacq.) ... Šumarski list br. 3–4, CXXX (2006), 101-111
trees. The least infestation was noted in two management units (MU) of the Forest Office
Garešnica: MU Garjevica 0.3 % and MU Dišnica-Zobikovac-Petkovača 0.5 %.


An infestation of less than 2 % was also found in the MU Pakračka gora-Zapadni Papuk,
Forest Office Pakrac (1.7 %). Then the MU Javornik, Forest Office Sirač with 4.3 %,
follows, and the MU Vrbovečke prigorske šume, Forest Office Vrbovec with 4.8 % and the
MU Krnjača-Gradina-Sječa, Forest Office Garešnica with 6.0 % of infestation. In the
area of Bilogora the infestation was higher and it amounted to 7.4 % for the MU Virovitička
Bilogora of the Forest Office Virovitica, 10.0 % for the MU Suhopoljska Bilogora of
the Forest Office Suhopolje, and 14.0 % for the MU Bjelovarska Bilogora of the Forest
Office Bjelovar, which is at the same time the highest infestation on the sessile oak in a given
management unit.


Yellow mistletoe was found on the pedunculate oak in the area of 8 forest offices: Bjelovar,
Čazma, Garešnica, Grubišno Polje, Suhopolje, Velika Pisanica, Veliki Grđevac
and Vrbovec. The research was carried out in 19 management units and 173 compartments
on a specimen of 12.711 trees. Out of the total number of investigated trees, 7 %
were infested with mistletoe. On the infested trees there were 3 mistletoe shrubs on the
average, and the highest number of shrubs on one tree was 22. In the MU Česma of the
Forest Office Vrbovec no mistletoe was observed.


Up to 5 % of the infested were found in the MU Dišnica-Zobikovac-Petkovača (0.5 %)
and the MU Međuvode-Ilovski lug (1.8 %) of the Forest Office Garešnica, then the MU
Česma of the Forest Office Bjelovar (3.0 %), the MU Zdenački gaj-Prespinjača of the Forest
Office Grubišno Polje (4.2 %), the MU Krnjača-Gradina-Sječa of the Forest Office
Veliki Grđevac (4.7 %) and two management units of the Forest Office Vrbovec, MU
Bolčansko-žabljački lug (3.0 %) and MU Novakuša-Šikava (2.2 %). Between 5 and 10 %
of the infested trees were found in the MU Bolčansko-žabljački lug of the Forest Office
Bjelovar (5.6 %), MU Krnjača-Gradina-Sječa of the Forest Office Garešnica (7.0 %),
MU Dugački gaj-Jasenova-Drljež of the Forest Office Velika Pisanica (9.6 %), MU Čazmanske
nizinske šume of the Forest Office Čazma (8 %) and MU Suhopoljske virovitičke
nizinske šume of the Forest Office Suhopolje (9.7 %). Between 10 and 20 % of the investigated
trees were infested with mistletoe in the MU Bjelovarska Bilogora of the Forest Office
Bjelovar (15.1 %) and the MU Trupinski-Pašijanski gaj of the Forest Office Veliki
Grđevac (12.3 %). On more than 20 % of the investigated trees mistletoe was found in the
MU Trupinski-Pašijanski gaj of the Forest Office Garešnica (21.5 %), MU Bedenik of the
Forest Office Bjelovar (24.6 %) and the MU Pisanička Bilogora of the Forest Office Velika
Pisanica (24.6 %). The highest infestation was noted in the MU Varoški lug of the Forest
Office Vrbovec (30.5 % of the investigated trees).


White mistletoe was found on 36 % of investigated white poplar trees (Forest Office Virovitica),
on 12 % of investigated common locust trees (Forest Office Bjelovar), as well as
on 2.4 % of investigated sessile oak trees (Forest Office Garešnica). The occurrence of
white mistletoe on autochthonous European oaks is very rare, and the MU Garjevica of
the Forest Office Garešnica is the only locality in Croatia in which it has been found so far.


For the sessile and pedunculate oak the correlation between the occurence of yellow
mistletoe and the site and stand parameters: site quality, expositionure, soil type, age,
crown closure and elevation was analyzed. A positive correlation between the tree age
and mistletoe infestation could be established, as well as a negative correlation between
the elevation and the infestation with yellow mistletoe. The infestation is also influenced
by the crown closure, and subcompartments with a very dense and dense crown closure
are considerably less infested than subcompartments with an incomplete or discontinued
crown closure.


The spacial arrangement of the infestation intensity of the sessile and pedunculate oak
with yellow mistletoe in particular management units is shown.


Key words: Loranthus europaeus Jacq., Viscum album L., Quercus petraea (Matt.)
Liebl., Q. robur L., Populus alba L., Robinia pseudoacacia L., mistletoe, infestation, Croatian
Forests Co. Ltd., Forest Administration Bjelovar.


Ill