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Modelling herbivore movement and colonization: pest management potential of intercropping and trap cropping
Authors:John E. Banks   Barbara Ekbom
Affiliation:Interdisciplinary Arts &Sciences, University of Washington, Tacoma 1900 Commerce Street, Tacoma, WA 98402, U.S.A. and;Department of Entomology, Swedish University of Agricultural Sciences, PO Box 7044, S-75005 Uppsala, Sweden
Abstract:
1 Using a stochastic simulation model, we explored the effects of agroecosystem diversity on herbivore densities. 2 Using parameters that included reproduction, colonization, and local movement rates, we simulated an insect herbivore population colonizing rows of plants in an agricultural setting. 3 Plant rows were comprised of either principal crop, intercrop, or trap crop. Herbivore parameters varied for different plant types. 4 Percent crop cover and movement rates were varied, and ensuing herbivore densities on crop rows were recorded. 5 In trap cropping schemes, both percent crop cover and movement rates were critical in determining herbivore densities. Intercropping schemes were governed primarily by colonization rates. 6 These results suggest that trap cropping schemes merit more attention than intercropping systems in the design and analysis of mixed cropping systems.
Keywords:Emigration    insect behaviour    simulation model    vegetation diversity
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