History 31 Natural enemies 24 Plant Pests, (New March 2000) 22 Pathogens, Parasites and Infectious Diseases (Wild Animals), (New March 2000) 21 Taxonomy and Evolution 21 Biochemistry 19 Biological Control 19 History and criticism 19 Molecular biology 19 Biological control 17 Plant pests 17 Statistics 17 Wild life 17 Literature 16 Taxonomy 16 Biological control agents 15 Ecology 15 Fruit crops 15 Microbiology 15 Wild animals 15 English novel 14 Mathematical statistics 14 Mathematics 14 Pest control 14 Andy Davies 13 Bacterial diseases of fruits 13 Bob Lewis 13 Bob Wilson 13 Fred Fawbert 13 Friut cracking 13