Tourism and Travel 80 Leisure, Recreation and Tourism Economics, (New March 2000) 69 Social Psychology and Social Anthropology, (New March 2000) 69 Policy and Planning 62 Tourism 60 Natural Resource Economics, (New March 2000) 58 Plant Pests, (New March 2000) 58 Sustainability 58 Plant Breeding and Genetics 54 Agricultural Economics 49 Plant pests 49 Horticultural Crops, (New March 2000) 48 History 46 Viral, Bacterial and Fungal Diseases of Plants, (New March 2000) 44 Plants 41 Plant Production 40 Taxonomy and Evolution 40 Plant diseases 39 Behaviour 38 Man 37 Plant pathogens 36 Field Crops, (New March 2000) 35 Marketing and Distribution 35 Natural enemies 35 Pest control 35 Taxonomy 35 Insects 34 Case studies 33 Molecular Biology and Molecular Genetics, (Discontinued March 2000, Reinstated and Revised June 2002) 33 Environmental impact 32