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ŠUMARSKI LIST 1-2/1976 str. 62     <-- 62 -->        PDF

Summary


EASTERN WHITE PINE (PINUS STROBUS L): FOR AND AGAINST


Eastern White Pine was introduced in Yugoslavia 100 years and more ago,
especially into the western part of the country. In many localities it is naturally
regenerating aldredy. Therefore, in this country, we do not speak of it as a
foreign, but an acclimatized species.


According to investigations performed in the older cultures, it has been
established that Eastern White Pine possesses characteristics of a fast growing
species. This is specially evident in shorter rotations. According to the author´s
investigations it follows that Eastern White Pine at the age of 40 years is leading
in diameter and volume increments. After Eastern White Pine there follow Douglas
Fir and European Larch, while Scots Pine, Norway Spruce and Black Pine lag
considerably behind (Tab. 3).


Forest practice in this country has shown a great interest for the mentioned
species, particulary after 1960. According to the indices from nursery production
in the cultures established at that time, Eastern White Pine participated with ca.
19°/o. Some years ago, the first stem- and groupwise dieback of Eastern White Pine
in younger cultures was noticed. According to the first indicators, the cause of
the dieback was a fungal disease from the genera Verticicladiella, Graphium and
Armillaria.


Recently, there is a manifest tendency to leave out Eastern White Pine more
and more from the programmes of the production of planting material or afforestation
plans, so that there exists a danger of its being forsaken completely. In
this connection it is recommended as follows in the conclusion:


— The abandonment of Eastern White Pine does not represent a solution of
problems for forestry, it is rather a definite loss from the economic aspect;
— It is necessary to intensify still more the studying of the causes of the
dieback and to search for methods of controlling it;
— The proportion of Eastern White Pine in the afforestation plans in relation
to other species ought to be brought to a more realistic ratio than it was in
the past;
— Choice of site for planting Eastern White Pine ought to be taken into
account more than so far. Heavy pseudogley with unfavourable water-air regime
and microsite, which, because of the terrain relief and redistribution of water in
the soil are more strongly exposed to moistening, ought to be avoided.
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