Effects of field location and cereal species on the number of grain aphid (Sitobion avenae F.) and its parasitoids (Hymenoptera parasitica).

摘要

The effects of field location in an agricultural landscape on the number of grain aphid (Sitobion avenae) and its natural enemies (parasitoids) were determined in a field experiment conducted in rye and winter wheat plantations in Poland during 1995-1997 and 2000. The populations of S. avenae were higher in crop lands adjacent to shrubs, orchards and boundary strips than in plantations located within other cultivated fields. In addition, higher number of Hymenoptera parasitica were obtained while rearing them from the aphid colonies collected from these plantations..