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S. England ; E. Evans | 1997The ability of parasitoids to attack their hosts may be influenced by the availability of adult food sources such as homopteran honeydew. To test this hypothesis for the wasp Bathyplectes curculionis (Thomson), a parasitoid of the alfalfa weevil[...]article/chapitre/communication
M. Van Helden ; H. Van Heest ; T. Van Beek ; W. Tjallingii | 1995article/chapitre/communication
E. Evans ; S. England | 1996The population dynamics of insect pests in agroecosystems may often be linked to those of other phytophagous species through the foraging activities of natural enemies; these indirect interactions provide both opportunities and challenges for bi[...]article/chapitre/communication
M. Vanhelden ; W. Tjallingii ; A. Teris ; T. Vanbeek | 1994The chemical composition of phloem sap from lettuce, collected by three different methods, was compared. Phloem sap from stylectomy samples contained sucrose and 14 amino acids. Honeydew and EDTA chelation samples showed considerable breakdown o[...]article/chapitre/communication
M. Vanhelden ; W. Tjallingii ; T. Vanbeek | 1994Three methods to collect phloem sap on different lettuce lines were optimized and are described in detail. The success ratio for stylectomy of aphids was over 80% through the combination of a specially designed setup and electrical penetration g[...]