Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Injuries to seeds and cones of silver fir Abies alba Mill. from pests in selected stands of the Świętokrzyski National Park.

Abstract

Field and laboratory investigations were carried out in 1987-92 on the insect pests colonizing cones of silver fir Abies alba in the Świętokrzyski National Park, Poland. The investigations found 14 537 insect specimens representing 22 species belonging to 5 orders. The insects found in cones served for differentiation of the following coenotic groups: conophages (3 species), seminiphages (2 species), conophage and seminiphage parasitoids (6 species), saprophages (1 species), and seasonal insects (10 species). Insects dominating the study area were as follows: Earomyia impossibile (a conophage), Megastigmus suspectus and Resseliella piceae (seminiphages), Inostemma melicerta and Mesopolobus pinus (conophage and seminiphage parasitoids), and Cryptophagus scanicus (a seasonal species). R. piceae and E. impossibile were absolutely permanent species, and M. suspectus and Barbara herrichiana (a conophage) were less permanent. Differences in the occurrence of pests in various forest site types were studied. It was found that the number of individuals of M. suspectus and E. impossibile on the mountain deciduous forest site was almost 2 times greater than on the hilly mixed deciduous forest sites. When slope aspect was considered it was found that M. suspectus, E. impossibile and Dioryctria abietella (a conophage) occurred in greater numbers on southern slopes. R. piceae and E. impossibile were the most serious pests identified in the study.