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ŠUMARSKI LIST 7-8/1986 str. 104     <-- 104 -->        PDF

formation of barren areas and degraded forests, which could not have been
prevented by regulations, although they were already introduced in the statutes
of some towns.

In the second half of the last century, the lowland forests of Posavina and
Podravina were subjected to intensive exploitation. As a result of the changes in
the forest ecolsystems, there occurred a weakening of their stability. Civilisation
and progress in technic and technology was accompanied with severe interventions
by people in biosphere, primarily in the forests, and also outside them.
The aforementioned caused changes in the water regime in the soil and all
dependant physiological processes, and favourable climatic conditions contributed
to the mass spreading of pests and diseases.

Today, the main problem in forest protection in the dying out of the important
and dominant species in the natural forests of oak, elm, ash, beech, fir and
pine. Defoliators play an important role in this process. Thus, investigations
are directed towards the discovery of effective methods for their control. A
transition was made from the organic-origin preparations to organic synthetic
insecticides (DDT, HCH) and organogenic phosphorous substances, which, after
being in use for approximately 20 years were substituted by the biological
preparations (Dipel, Bactospeine, Thuricide, etc). Recently, a transition was made
to the inhibitors of chytin synthesis (diflourbenzuolor), Dimilin preparation, and
the application of feromon (Pheroprax) in prognostic service; as well as in the
repressive sense.

Attention was paid to the integrated methods of pest control, as well as
testing for the control of pathogens by fungicides and other methods of inoculation
with hypovirulent strains (in Endothia parasitica).

During the application of pesticides, records are made of their effect on the
environment. The hypothesis of forest dying out due to the emissions is a subject
open to investigation, and initial investigative steps have already been made.

Prof. Dr. Ankica Pranjić

Forest Management and forest Mensuration

Our cultivation of forests and their evaluation was done according to special
laws in the past. Besides some positive roles which those laws had in the past,
they did, however, without doubt, limit the development of dendometry, fotogrametry
and biometry. Meanwhile, keeping in mind today´s situation of forest
here and around the world, and also the multi-purpose of the forest, the system
of gathering information needs to be much larger than before. Information derived
from dendometry and photogrametry is not enough on which to base the
planning of forestry.

Planners have to get all the information on ecologically cultivated types and
establish plans of cultivation which need to be flexible and able to cope with
outside influence and internal changes of the eco-system. In forming a plan
of cultivation, one cultivated form of forest needs to be examined by a team
of specialists from different professions. Regarding the huge amount of informa