Arthropod natural enemies in arable land. Density, spatial heterogeneity and dispersal

Proceedings of the First EU WOrkshop held at the University of Aarhus, Danmark from 21-23 October 1993 on the enhancement, dispersal and population dynamics of beneficial insects in integrated agroecosystems, entitled: "Estimating population densities and dispersal rates of beneficial predators and parasitoids in agroecosystems."