A field study on insects inhabiting cones of Larix decidua Mill. subsp. polonica (Racib.) Domin, was carried out in the protected forest reserve "Modrzewie" and its surrounding (the Krościenko Forest District) in 2011. A total of 2210 cones (12 samples) from larches were collected for analysis and for rearing. Moreover 3600 seeds extracted from cones, were analysed. During the studies 1687 insect specimens were obtained. They belong to 4 orders: Hemiptera, Coleoptera, Hymenoptera and Diptera. The most numerous species was Megastigmus pictus (Först.) (Hym., Torymidae): 850 specimens including 4 males. M. pictus destroyed 10.94% of analysed seeds. Strobilomyia laricicola (Karl) inhabited 13.06% of analysed cones. Information on parasitoids are given.
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