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 Sustainability 59 Tourism 59 Natural Resource Economics, (New March 2000) 58 Plant Pests, (New March 2000) 58 Plant Breeding and Genetics 53 Plant pests 49 Agricultural Economics 48 Horticultural Crops, (New March 2000) 48 Viral, Bacterial and Fungal Diseases of Plants, (New March 2000) 44 Plants 43 Man 41 Plant Production 40 Taxonomy and Evolution 40 Plant diseases 39 Behaviour 38 Plant pathogens 36 Field Crops, (New March 2000) 35 Insects 35 Marketing and Distribution 35 Natural enemies 35 Pest control 35 Taxonomy 35 Case studies 33 Molecular Biology and Molecular Genetics, (Discontinued March 2000, Reinstated and Revised June 2002) 33 Environmental impact 32 Crop Produce 30