Individual study: Strip-management in rape crop: is winter rape endangered by negative impacts of sown weed strips?
Hausammann A. (1996) Strip-management in rape crop: is winter rape endangered by negative impacts of sown weed strips? Journal of Applied Entomology, 120, 505-512
This study is summarised as evidence for the intervention(s) shown on the right. The icon shows which synopsis it is relevant to.
Plant nectar flower mixture/wildflower strips
A replicated, controlled study in April-June 1993 in one winter rape field near Bern, Switzerland (Hausammann 1996) found lower numbers of pest species (mainly pollen beetles Meligethes spp. and cabbage weevils Ceutorhynchus spp.) near a sown weed strip than near a field boundary, at least early in the season. There was no difference in the abundance of predators and parasitoids between transects near the weed strip and the boundary. A 1.5 m-wide weed strip was sown with a seed mixture containing 25 varieties of annual, biennial and perennial plant species in the middle of a 3.8 ha winter rape field in spring 1992. The composition of the seed mixture was designed to provide flowering plants over the whole growing season. The strip was not cut or treated for three years. Adult and larval arthropods in the rape field were sampled weekly along transects at 3, 10, 20 and 50 m from the weed strips and the opposite field boundary from April-June 1993 using several different methods (visual counting, sweep netting, dissecting of rape pods and using water traps).