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Forty-six species of leaf-mining butterflies (Gracillariidae) were recorded in the Roztocze Środkowe (SE Poland) on the basis of materials collected there from 1987 to 1990. The richest was the fauna in the xerothermic shrubs.
A list of 74 species of the family Gracillariidae is given as a result of inventory studies carried out in the Skarpa Ursynowska reserve in Warsaw.
Ten hymenopteran species of the family Ichneumonidae (2 species) and superfamily Chalcidoidea (8 species) had been reared from cocoons of Callisto denticulella (THNBG.). Such parasitoids as Gelis areator (PANZ.), Chrysocharis pentheus WALK., Pedobius saulius WALK., Dibrachys cavus WALK., Eupelmus fulvipes FÖRSTER, Eupelmus urozonus DALMAN, Eurytoma goidanichi BOUCEK and Parablastothrix montana ERDÖS had not been reported from the host before. E. fulvipes, E. goidanichi and P. montana are species new to Poland.
The influence of distance between host trees and leaf litter removal on population density of Cameraria ohridella have been for the first time examined in an isolated population of horse chestnut (Aesculus hippocastanum L.) trees. The observation was performed in the small town (area 13,58 km²) in Wielkopolska region (West Poland) on the total number of 49 trees: 31 (11 clumps) of them with autumnal leaves removal (controlled sites), and 18 (5 clumps) without this procedure (uncontrolled sites). The main factors determining the extent of the leaf destruction by larvae were the leaf litter removal and the number of subsequent generations on a given tree. The effect of mean distance between trees on the infestation level was statistically significant only for the third generation larvae, when analyzing all sites. There was no significant correlation when checking the impact of mean and short distance on the leaves infestation between controlled and uncontrolled sites. The abundance of the first generation of the larvae of raked sites is possibly a result of low number of in situ overwintering individuals and the number of immigrants from uncontrolled areas. Assuming the random choice of direction of the migration, the effect of the immigrants on the trees which leaves have been disposed of is not as high as it should be expected. Additionally, the moths can be blown away by the wind in a random direction. Consequently, the noted increase in the leaves infestation by the third generation larvae can be result of the rate of population increase innate for the species and only partly a result of immigration from refuge areas.
First records of Phyllonorycter leucographella (ZELL.) from Poland are given. The species was found in three localities in the western part of Poland.
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