Forest pests Plant Pests, (New March 2000) 4 Plant pests 4 Forests and Forest Trees (Biology and Ecology) 3 Insect pests 3 Insects 3 Natural enemies 3 Pest control 3 Plant pathogens 3 Viral, Bacterial and Fungal Diseases of Plants, (New March 2000) 3 Arthropod pests 2 Biological Control 2 Biological control 2 Biological control agents 2 Insect control 2 Introduced species 2 Pest management 2 Plant Ecology 2 Plant diseases 2 Protozoan, Helminth, Mollusc and Arthropod Parasites of Animals, (New March 2000) 2 Public Health Pests, Vectors and Intermediate Hosts, (New March 2000) 2 Vertebrate pests 2 Weeds 2 Weeds and Noxious Plants 2 Agricultural entomology 1 Air pollution 1 Amphibia 1 Animal Ecology 1 Antagonists 1 Aquatic Biology and Ecology 1