caa a22 4500 397571593 CHVBK 20180308164843.0 cr unu---uuuuu 161202e19961001xx s 000 0 eng 10.1093/ee/25.5.1092 doi (NATIONALLICENCE)oxford-10.1093/ee/25.5.1092 Intercropping as a Management Strategy Against Carrot Rust Fly (Diptera: Psilidae): A Test of Enemies and Resource Concentration Hypotheses [Elektronische Daten] [Birgitta RäMerti, Barbara Ekbom] Intercropping with lucerne, Medicago littoralis Rohne ex. Loisel, as a management strategy for carrot rust fly, Psila rosae (F.), was studied to understand why intercropping results in lower damage. Densities of polyphagous predators were experimentally enhanced and decreased using ingress and egress plots. The manipulation method was successful for carabids and for spiders in the family Lycosidae and the order Opiliones. The method was less effective for staphylinids and linyphiid spiders. These results are discussed in relation to carrot rust fly damage and earlier experiments with abundance of polyphagous predators in carrots, Daucus carota L., in monoculture and intercrop. In field experiments, D-vac catches were used to measure the number of flies in 2 treatments arranged in 3 different ways. More flies were caught in the monoculture treatment when plots were placed next to each other or placed apart from each other and surrounded with ley (i. e., nonhost) vegetation, but no difference was found between treatments when plots were surrounded by bare soil. In greenhouse experiments, egg deposition was lower in intercropping. These results are discussed in relation to damage levels, which were alwayslower in intercropping. Wealso discuss our results with regard to the possible outcome of scaling up our small plot experiments to full scale cropping practices. © 1996 Entomological Society of America Population Ecology nationallicence Psila rosae nationallicence Medicago littoralis nationallicence polyphagous predators nationallicence resource concentration nationallicence RäMerti Birgitta Horticultural Research Station, Swedish University of Agricultural Sciences, P.O. Box 7052, S-75007 Uppsala aut Ekbom Barbara Department of Entomology, Swedish University of Agricultural Sciences, P.O. Box 7044, S-75007 Uppsala aut Environmental Entomology Oxford University Press 25/5(1996-10-01), 1092-1100 0046-225X 25:5<1092 1996 25 ee https://doi.org/10.1093/ee/25.5.1092 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1093/ee/25.5.1092 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- RäMerti Birgitta Horticultural Research Station, Swedish University of Agricultural Sciences, P.O. Box 7052, S-75007 Uppsala aut NATIONALLICENCE 700 1- Ekbom Barbara Department of Entomology, Swedish University of Agricultural Sciences, P.O. Box 7044, S-75007 Uppsala aut NATIONALLICENCE 773 0- Environmental Entomology Oxford University Press 25/5(1996-10-01), 1092-1100 0046-225X 25:5<1092 1996 25 ee Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford