Articles
INVESTIGATION OF SPIDER COMMUNITIES IN DIFFERENT TREATED APPLE ORCHARDS IN HUNGARY
During our work 786 spiders were collected in the ground level.
The adult spiders were indentified, one part of the juvenile spiders are not determinable.
The main spider family (at about 70 % of all collected spiders was the Lycosidae (dominant species were Alopecosa sulzeri, Pardosa lugubris, Xerolycosa nemoralis, Pardosa agrestis).
The differences between the plots in number of individuals were not significant in 1992-93. In 1994 the number of individuals was twice higher in IPM plots than in COM plot.
The traps collected 2–4 times more spiders in the edge of the orchard.
To follow the population dynamic it was determine that the intensive moving activity of spiders in the ground level were in April-May.
In the edge we could observe the higher number of spiders till August.
In the treebands we collected only clubionid spiders (Clubionidae). The dominant species was the Clubiona pallidula in all investigated plots.
The number of collected spiders was 3-6 times higher in IPM plots.
We observed that these spiders prey on pear lace bugs (Stephanitis piri) this pest overwintered in treebands together with spiders and positive correletion was found between the number of bugs and the number of spiders.