Evaluating the enemies hypothesis in a clover‐cabbage intercrop: effects of generalist and specialist natural enemies on the turnip root fly ( Delia floralis )
作者: Maria BjörkmanPeter A. HambäckRichard J. HopkinsBirgitta Rämert
作者单位: 1Department of Crop Production Ecology, Swedish University of Agricultural Sciences (SLU), PO Box 7043, SE‐750 07 Uppsala
2 Department of Botany, Stockholm University, SE 106 91 Stockholm
3 Department of Ecology, Swedish University of Agricultural Sciences, PO Box 7047, SE 750 07 Uppsala
4 Department of Plant Protection Biology, Swedish University of Agricultural Sciences, PO Box 44, SE 230 53 Alnarp, Sweden
刊名: Agricultural and Forest Entomology, 2010, Vol.12 (2), pp.123-132
来源数据库: Wiley Journal
DOI: 10.1111/j.1461-9563.2009.00452.x
关键词: Delia radicumnatural enemies hypothesisparasitizationpredationresource concentration hypothesis
原始语种摘要: 1 The relative importance of the resource concentration hypothesis and the enemies hypothesis was investigated for the turnip root fly Delia floralis in a cabbage–red clover intercropping system compared with a cabbage monoculture.(#br)Delia floralis egg densities were measured as well as the activity‐densities of generalist predators in a field experiment during two growing seasons. In the second year, a study of egg predation with artificially placed eggs was conducted, in addition to a predator exclusion experiment, to estimate total predation during the season. Parasitization rates were estimated from samples of pupae.(#br)Delia floralis oviposition was greater in the monoculture during both years. The predator activity‐densities differed...
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