Dedication. Contributors. Preface. Section I. General Framework. 1. Ecological risk assessment framework for biological control agents; H.M.T. Hokkanen et al. Section II. Entomopathogenic fungi. 2. Entomopathogenic fungi as classical biological control agents; A.E. Hajek et al. 3. Safety of Hyphomycete fungi as microbial control agents; S. Vestergaard et al. 4. Assessing the impacts of Metarhizium and Beauveria on bumblebees; H.M.T. Hokkanen et al. Section III. Viral insecticides. 5. Ecological impacts of virus insecticides: host range and non-target organisms; J.S. Cory. Section IV. Entomopathogenic microsporidia. 6. Environmental safety of microsporidia; L.F. Solter and J.J. Becnel. Section V. Bacterial Insecticides. 7. Environmental impacts of bacterial biopesticides; T.R. Glare and M. O'Callaghan. 8. The safety of bacterial microbial agents used for black fly and mosquito control in aquatic environments; L.A. Lacey and R.W. Merritt. 9. Environmental safety of inundative application of a naturally occurring biocontrol agent, Serratia entomophila; T.A. Jackson. Section VI. Entomopathogenic nematodes. 10. Biocontrol nematodes; R.-U. Ehlers. Section VII. General aspects of environmental risk assessment. 11. Ecological insights into factors affecting the non-target impact of microbial control agents; M.B. Thomas and L.D. Lynch. 12. Regulatory requirements for ecotoxicological assessments of microbial insecticides -- how relevant are they?; S.T. Jaronksi et al. Index.