Section I: The Theory, Ecological Basis and Assessment of Biological Control.- 1. The Pesticide Syndrome—Diagnosis and Suggested Prophylaxis.- The Pesticide Syndrome.- The Suggested Prophylaxis.- The cotton picture.- The grape picture in California.- Conclusion.- Literature Cited.- 2. The Natural enemy Component in Natural Control and the theory of Biological Control.- Natural Control—The Balance of Nature.- The Process of Natural Control.- The concept of control by density-unrelated factors.- The concept of density-dependent regulation.- Demonstrations of characteristic abundance and density dependence.- The regulatory mechanism and the instruments.- The Nature of Regulation by Natural Enemies.- The kinds of natural enemies.- Models of host-parasite (parasitoid) or predator-prey interactions.- The functional, numerical and over-all response.- Damping processes and regulation by natural enemies.- The role of natural enemies in control, regulation, and change in density of hosts.- Challenging Concepts Relative to the Theory and Practice of Biological Control.- Species stability and community stability.- Multiple introductions versus single species introductions.- Polyphagous versus monophagous or stenophagous enemies.- Direct and indirect pests in biological control work.- The claim that biological control is an unprofitable endeavor.- The Genetic Feed-Back Principle and Biological Control.- Conclusions.- Literature Cited.- 3. The Adaptability of Introduced Biological Control Agents.- Procedures Restricting the Genetic Variability of Colonizing Stocks.- Different Natural Enemies Contemporaneously Attacking a Host in the Same Region.- Varying Performances of an Enemy in Different Ecological Situations.- Different Adaptabilities Exhibited Among Strains of a Natural Enemy.- Host-specific strains.- Differential host immunity to strains of natural enemies.- Climatic strains.- Possibilities for Improving Adaptations.- Lessons for Future Strategies.- Literature Cited.- 4. The use of Models and Life tables in Assessing the Role of Natural Enemies.- Terminology for Components of Population Models.- Objections to the Nicholson and Bailey Model.- Parasite Quest Theory.- The development of a model.- Experimental verification.- Literature Cited.- 5. Experimental Techniques for Evaluation of the effectiveness of Natural Enemies.- Selection of Test Plots.- Experimental Methods of Evaluation.- Discussion and Conclusions.- Literature Cited.- Section II: Outstanding recent Examples of Classical Biological Control.- 6. The Biological Control of weeds by Introduced Natural Enemies.- The Alligatorweed.- Puncturevine.- Lantana in Hawaii.- Prickly Pear in California.- Tansy Ragwort.- Discussion.- Literature Cited.- 7. Biological Control of coccids by Introduced Natural Enemies.- Cottony Cushion Scale in California.- Some Recent Examples of Biological Control of Scale Insects.- Florida red scale.- Olive scale.- California red scale.- Summary and Conclusions.- Literature Cited.- 8. Control of pests in glasshouse culture by the Introduction of Natural Enemies.- Some Biological Control Techniques.- Control of red spider mite.- Control of whitefly.- Control of the cotton aphid.- Control of the aphid Myzus persicae (Sulz.).- Control of the leaf-miner Phytomyza syngenesiae Hardy on chrysanthemums.- A biological control program for the pest complex on cucumbers.- Biological control system for pest complex on year-round chrysanthemums.- The commercial future of biological control in glasshouses.- Literature Cited.- 9. The Biological control of the winter moth in Eastern Canada by Introduced Parasites.- Introduction, Results, and Discussion.- Literature Cited.- 10. Biological Control of Rhodesgrass scale by Airplane releases of an Introduced Parasite of Limited Dispersing ability.- Population Regulation of Rhodesgrass Scale by N. sangwani.- Scale control and yield response in model-type experiments.- Scale control, population data, and yield response on natural range sites.- Rhodesgrass pasture longevity with bio-control.- The Development of Mass Release Procedures and the Results Obtained.- Female N. sangwani longevity.- Mobility of N. sangwani females.- Colony establishment influenced by life stages used, number of females released and timing of releases.- Results from large area distribution studies.- Discussion.- Summary.- Literature Cited.- Section III: The Unheralded Naturally-Occurring Biological Control.- 11. The importance of Naturally-Occurring Biological control in the Western United States.- Natural Ecosystems.- Coniferous forests.- Lepidoptera.- Scale insects.- Bark beetles.- Sawflies.- Oak woodland.- Chaparral biome.- Sagebrush, grasslands and range.- Agro-ecosystems.- Fruit and nut trees.- Grapes.- Alfalfa.- The alfalfa caterpillar.- The spotted alfalfa aphid.- The pea aphid.- Noctuiid moths.- Cotton.- Strawberries.- Literature Cited.- 12. Naturally-Occurring Biological Control in the Eastern United States, with particular Reference to Tobacco Insects.- Major Features of Tobacco Culture Relative to Natural Enemy Actions.- Enemies Reduce the Localized Economic Loss.- Enemies Reduce the General Pest Problem.- Enemies Tractable to Manipulation.- Enemies as Indices of Pest Population Trends.- Cryptic Enemies of Importance.- Literature Cited.- 13. Cases of Naturally-Occurring Biological control in Canada.- Case Histories.- European red mite.- Lecanium scale.- Codling moth.- Black-headed budworm.- Summary and Conclusions.- Literature Cited.- Section IV: Biological Control as a key Element in the systems approach to Pest Control.- 14. Systems analysis and pest management.- The Systems Analysis Approach.- Data processing.- Execution of ecological research.- Systems Analysis and Pest Management.- Methods and procedures for use in pest management.- Concluding Remarks and Summary.- Literature Cited.- 15. Microbial control as a tool in integrated Control Programs.- Use of Microbial Control in Integrated Control Programs.- Major considerations.- Examples of practical application.- Microbial Control Research in California.- Cotton insects.- The granulosis virus of codling moth.- Conclusions.- Literature Cited.- 16. Management of pest populations by Manipulating Densities of both hosts and parasites through Periodic Releases.- Imported Cabbageworm Experiments.- Other Cabbage Pests.- Conclusions.- Literature Cited.- 17. The Developing program of integrated control of Cotton Pests in California.- Integrated control defined.- Development of the Integrated Control Program.- Economic thresholds.- Bollworm studies.- Other lepidopterous pests.- Light trap studies.- Alternatives to chemical control.- Supervised control.- Integrated Control and the Economic Crisis in Cotton.- Literature Cited.- 18. The Developing Programs of integrated control of pests of apples in Washington and Peaches in California.- The Developing Program of Integrated Control of Pests of Apples in Washington.- Populations of mites on apple.- With standard acaricide programs.- With no spray program.- Distribution of predators and prey.- Feeding behavior of predators.- Effects of pesticides on predator numbers.- Insect and disease problems on apple.- Integrated control programs.- Mite populations without apple rust mites.- Mite populations with apple rust mites present.- Cultural practices and the integrated program.- Advantages of the integrated program.- Disadvantages of the integrated program.- Commercial use of integrated control.- The Developing Program of Integrated Control of Pests of Peaches in California.- The pest complex on peach.- Reappraisal of control techniques.- The program and results.- Oriental fruit moth and peach twig borer.- The European red mite and the two-spotted spider mite.- The predatory mite Metaseiulus occidentalis.- The peach silver mite.- Comments.- Literature Cited.- 19. Development of Integrated Control Programs for Pests of Tropical Perennial Crops in Malaysia.- Oil Palms.- Leaf-eating caterpillars.- West Malaysia.- East Malaysia.- Red spider mites.- The bunch moth.- Rhinoceros beetle.- Other pests.- Cocoa in Sabah.- Rubber in West Malaysia.- Discussion.- The need for and the manner of the integrated approach.- Illustration of some general principles of biological and integrated control.- The establishment of integrated control in the tropics.- Literature Cited.- 20. Development of Integrated Control Programs for Crop Pests in Israel.- Citrus Pests.- Cotton Pests.- Olive Pests.- Deciduous Fruit Tree Pests.- Literature Cited.- Author Index.