The western corn rootworm (WCR), Diabrotica virgifera virgifera LeConte, is a new pest of corn in Europe. Future management may include the use of natural enemies. Our study focused on the determination of density and species composition of spiders in corn fields, as well as in the adjacent corn field margins, during the peak flight period of WCR adults. An additional objective was to test different sampling methods, used for spider collecting, in corn fields and in adjacent corn field margins. The field study was conducted in July and August, 1999, in experimental corn plots, as well as in the adjacent field margins, owned by the Cereal Research Institute, Szeged, in Southern Hungary. Spiders were collected by individual plant search and by sweep nets. Number of spiders /m2 was significantly higher, whereas /m3 was significantly lower in the corn plots compared to the adjacent field margins. Remnants of WCR adults were found in theridiid [Theridion impressum L. Koch, T. pictum (Walckenaer), Enoplognatha latimana Hippa and Oksala] and agelenid (Agelena sp.) webs. We observed that individuals of both families were able to kill 1-5 adult beetles within 90 minutes.
Sunderland, K. D., De Snoo, G. R., Dinter, A., Hance, T., Helenius, J., Jepson, P., Kromp, B., Lys, J.-A., Samu, F., Sotherton, N. W., Toft, S. and Ulber, B. (1995): Density estimation for invertebrate predators in agroecosystems. In: Toft and Riedel (eds): Arthropod Natural Enemies in Arable Land I. Acta Jutlandica 70, 133-162.
'Density estimation for invertebrate predators in agroecosystems ' () 70 Arthropod Natural Enemies in Arable Land I. Acta Jutlandica : 133 -162.
Bogya, S. and Mols, P. J. M. (1996): The role of spiders as predators of insect pests with particular reference to orchards: a review. Acta Phytopath. Entomol. Hung. 31, 83-159.
'The role of spiders as predators of insect pests with particular reference to orchards: a review ' () 31 Acta Phytopath. Entomol. Hung. : 83 -159.
Hance, T. (1992): Spring densities of ground beetles (Coleoptera: Carabidae) in cultivated fields. Bull. Annls Soc. Belge Ent., 128, 319-324.
'Spring densities of ground beetles (Coleoptera: Carabidae) in cultivated fields ' () 128 Bull. Annls Soc. Belge Ent. : 319 -324.
Johnson, S. R. (1996): Use of a coleopteran prey by Phidippus audax (Araneae, Salticidae) in tallgrass prairie wetlands. J. Arachnol. 24, 39-42.
'Use of a coleopteran prey by Phidippus audax (Araneae, Salticidae) in tallgrass prairie wetlands ' () 24 J. Arachnol. : 39 -42.
Kuhlmann, U. and van der Burgt, W. A. C. M. (1998): Possibilities for biological control of the western corn rootworm, Diabrotica virgifera virgifera LeConte, in Central Europe. Biocontrol News and Information 19, 59-68.
'Possibilities for biological control of the western corn rootworm, Diabrotica virgifera virgifera LeConte, in Central Europe ' () 19 Biocontrol News and Information : 59 -68.
Lockley, T. C., Young, O. P. and Hayes, J. L. (1989): Nocturnal predation by Misumena vatia (Araneae, Thomisidae). J. Arachnol. 17, 249-251.
'Nocturnal predation by Misumena vatia (Araneae, Thomisidae) ' () 17 J. Arachnol. : 249 -251.
Pekár, S. (2000): Webs, diet, and fecundity of Theridion impressum L. Koch (Araneae: Theridiidae). Eur. J. Entomol. (in press).
Roach, S. H. (1987): Observations on feeding and prey selection by Phidippus audax (Hentz) (Araneae: Salticidae). Environ. Entomol. 16, 1098-1102.
'Observations on feeding and prey selection by Phidippus audax (Hentz) (Araneae: Salticidae) ' () 16 Environ. Entomol. : 1098 -1102.
Samu, F. and Sárospataki, M. (1995): Design and use of a hand-hold suction sampler, and its comparison with sweep net and pitfall trap sampling. Folia Entomol. Hung. 56, 195-203.
'Design and use of a hand-hold suction sampler, and its comparison with sweep net and pitfall trap sampling ' () 56 Folia Entomol. Hung. : 195 -203.
Schröder, T. W., Basedow, T. and Mangali, T. (1999): Population density of Theridion impressum L. Koch (Araneae, Theridiidae) in sugar beet fields in Germany, and its possible effects on numbers of Myzus persicae (Sulzer) (Hom., Aphididae). J. Appl. Entomol. 123, 407-411.
'Population density of Theridion impressum L. Koch (Araneae, Theridiidae) in sugar beet fields in Germany, and its possible effects on numbers of Myzus persicae (Sulzer) (Hom., Aphididae) ' () 123 J. Appl. Entomol. : 407 -411.
Stoewen, J. F. and Ellis, C. R. (1991): Evaluation of a technique for monitoring predation of western corn rootworm eggs, Diabrotica virgifera virgifera (Coleoptera: Chrysomelidae). Proceedings of the Entomological Society of Ontario 122, 27-33.
'Evaluation of a technique for monitoring predation of western corn rootworm eggs, Diabrotica virgifera virgifera (Coleoptera: Chrysomelidae) ' , , .
Tóth, F., Tálasné, Tóth, J., Kiss, J. and Edwards, C. R. (1998): Preliminary study on spiders as natural enemies of western corn rootworm (Diabrotica virgifera virgifera LeConte) adults in Hungary. IWGO-Newsletter 18, 22.
'Preliminary study on spiders as natural enemies of western corn rootworm (Diabrotica virgifera virgifera LeConte) adults in Hungary ' () 18 IWGO-Newsletter : 22.
Young, O. P. (1989): Field observations of predation by Phidippus audax (Araneae: Salticidae) on arthropods associated with cotton. J. Entomol. Sci. 24, 266-273.
'Field observations of predation by Phidippus audax (Araneae: Salticidae) on arthropods associated with cotton ' () 24 J. Entomol. Sci. : 266 -273.