research uses the concepts of agroecology to obtain a deeper understanding of the nature of agroecosystems and the principles by which they function. Particular focus is on the ways in which biodiversity can contribute to the design of pest-stable agroecosystems that are sustainable, economically viable, and natural resource conserving. Altieri received his PhD degree in entomology from the University of Florida.

GARY W. BARRETT is Odum Professor of Ecology at the University of Georgia. His research interests include stress effects (e.g., pesticides or fertilizers, sludge or fire) on ecosystem dynamics; mammalian population dynamics; applied ecology; agroecosystem ecology; restoration ecology; landscape ecology; ecological manpower, education, and research trends. Barrett is President of the American Institute of Biological Sciences. Barrett received his PhD degree from the University of Georgia.

GREG DWYER is the Galla Assistant Professor in the Department of Biological Sciences at the University of Notre Dame. His teaching and research focus on insect host-pathogen relationship, disease ecology, and modeling. Dwyer combines ecological field experiments and mathematical models to determine how the characteristics and interactions of individual organisms determine the dynamics of populations and communities. He received a PhD degree in entomology from the University of Washington.

MATT LIEBMAN is an Associate Professor of Agronomy at Iowa State University. His research interests include crop rotation, intercropping, and cover cropping systems; integrated production of crops and livestocks; and weed ecology and management. He received a PhD degree in botany from the University of California at Berkeley.

STEVE E. LINDOW is Chair, Microbial Biology Division in the Department of Plant and Microbial Biology at the University of California at Berkeley. His research emphasizes both molecular genetic and ecological approaches to the study of the interaction of epiphytic bacteria with other microorganisms on plants, as well as the interactions of these organisms with the plants on which they live. Lindow received his PhD degree in plant pathology from the University of Wisconsin, Madison.

CLARA INES NICHOLLS is Home Community Horticulture Advisor, University of California Cooperative Extension, Alameda County. Her research focuses on enhancing biological control of insect pests through biodiversification designs of cropping systems in urban as well as rural environments. Clara received her PhD degree in entomology from the University of California, Davis.

EUGENE P. ODUM is Callaway Professor Emeritus and Director Emeritus of the Institute of Ecology at the University of Georgia. He has pioneered

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