Dissertations, Academic (Ph.D) 34 Biological control agents 23 Natural enemies 23 Microbiology 22 Pharmacology and Toxicology 22 Biological Control 21 Biological control 21 Plant Pathology 20 History 17 Antineoplastic agents 16 Artificial intelligence 16 Thesis (Ph.D)-Biochemistry 16 Agent (Philosophy) 15 Plant Pests, (New March 2000) 14 Plant pests 13 Biological pest control agents 12 Pathogens 12 Pathogens, Parasites and Infectious Diseases (Wild Animals), (New March 2000) 12 Pest control 12 Cancer 11 Intelligent agents (Computer software) 11 Entomopathogens 10 Plant pathogens 10 Research 10 Social aspects 10 Women 10 Antibacterial agents 9 Bacterial Infections 9 English fiction 9 Microbiological Techniques 9