DIGITALNA ARHIVA ŠUMARSKOG LISTA
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ŠUMARSKI LIST 3-4/1971 str. 32     <-- 32 -->        PDF

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QUALITY OF FOOD AS ONE OF THE CAUSES OF MASS OUTBREAKS
OF PYGAERA ANASTOMOSIS L. IN EUROAMERICAN POPLAR PLANTATIONS


Summary


Pygaera anastomosis L. (Notodontidae, Lepidoptera) is an insect pest on Poplars
and Willows. In this country it produces 3 and partially 4 generations in a year, so
that the larvae damage threes from the early spring until the late autumn.


As a new and dangerous pest it appeared in Yugoslavia and in some other European
countries (Hungary, Austria, Czechoslovakia, Italy) only after the Second World
War when an intensive cultivation of Euroamerican Poplars on large surfaces started.
In some cases of its overpopulations in Poplar plantations chemical control had to
be undertaken.


The objective of the present invastigations was to examine the effect of food
quality on the development of Pygaera anastomosis L., for better knowledge of
causes of mass outbreaks of this insect pest in Euroamerican Poplar plantations. In
the laboratory experiments the larvae were fed on the foliage of the following
Poplars: Populus euroamericana cv. regenerata, P. nigra v. italica, P. tremula and
P, alba. The experiments lasted nearly two years and during this time 7 generations
in total were bred, which means, one complete annual life cycle and three generations
in addition. For each kind of food the following elements were determined: number
and duration of individual larval instars, as well as the total duration of the larval
stage, mortality of larvae and pupae, fecundity of females, sex ratio and reproductive
potential. In addition, the effect of food on the diapause of larvae was examined.