Abstract
Abstract: During 1989 and 1990 an inventory was made of beetles (Coleoptera), in the families Carabidae and Staphylinidae and spiders in carrot fields with a ley clipping mulch, a bark mulch, or lucerne (Medicago littoralis) as an intercrop. Two sites in central Sweden were included in the study. The most common carabid species at Uppsala were Bembidion quadrimaculatum, B. lampros, and Trechus quadristriatus. At Torslunda, B. lampros, Calathus melanocephalus, T. quadristriatus, Amara bifrons, and Harpalus rufipes were the most abundant. The most abundant staphylinid genera at Uppsala were Anotylus, Arpedium, Philonthus, and Aleochara, while at Torslunda Philonthus, Aleochara, and Anotylus were the most abundant. Differences in occurrence, measured as trap catch or numbers per soil sample, between treatments and over the season are presented and discussed. Emphasis was placed on assessing the potential importance of these predators in suppressing carrot fly populations.
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