Non-target insects in unsprayed cereal edges and aphid dispersal to the adjacent crop

摘要: : In 1992 and 1993 6 m wide edges of a winter wheat crop were not sprayed with herbicides insecticides to investigate the impact on abundance insects inhabiting upper parts farmland flowers. To this end, total 19 fields sampled using sweep nets. It was demonstrated that number insect groups as well density increases in unsprayed edges, by factor 1.4 3.5, respectively. At level 21 studied, too, significant increase numbers found for most groups. This held true aphid predators (mainly Coccinellidae), flower visitors adult Syrphidae) form staple diet bird species Motacilla flava flava. Although there an aphids did spread rest field, improving compatibility farm management.