Natural enemies 44 History 37 Biological Control 34 Biological control 33 Philosophy 31 Education 28 Plant Pests, (New March 2000) 24 Biological control agents 23 Feminism 20 Literature 20 Plant pests 20 Pest control 19 Social Sciences 19 Insects 18 Research 18 Women 18 Social sciences 17 Biography 16 Criticism and interpretation 16 Pathogens 16 Pathogens, Parasites and Infectious Diseases (Wild Animals), (New March 2000) 16 Social marketing 16 Sociolinguistics 16 Agricultural Entomology 14 Insect pests 14 Taxonomy and Evolution 14 Dissertations, Academic (Ph.D) 13 Drew, Nancy (Fictitious character) 13 Entomopathogens 13 Methodology 13