The population dynamics of the western and northern corn rootworms in four tillage systems

68 Introduction 69 Materials and Methods 71 Results and Discussion 74 References Cited 78 PART 4: INFLUENCE OF TILLAGE SYSTEMS AND WESTERN AND NORTHERN CORN ROOTWORM (COLEOPTERA: CHRYSOMELIDAE) EGG RATIO ON LARVAL POPULATIONS AND DAMAGE 96 Abstract 96 Introduction 97 Materials and Methods 99 Results and Discussion 103 References Cited 109 SUMMARY 119 ADDITIONAL REFERENCES CITED 121 ACKNOWLEDGEMENTS 126

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