Introduced species Plant Pests, (New March 2000) 4 Plant pests 4 Insect pests 3 Insects 3 Biological control agents 2 Forest pests 2 Forests and Forest Trees (Biology and Ecology) 2 Invasive species 2 Natural enemies 2 Other Control Measures 2 Pest control 2 Pest management 2 Pests 2 Plant Ecology 2 Plant pathogens 2 Quarantine 2 Vertebrate pests 2 Viral, Bacterial and Fungal Diseases of Plants, (New March 2000) 2 Air pollution 1 Amphibia 1 Animal Ecology 1 Animal genetic resources 1 Anthelmintics 1 Antiparasitic agents 1 Aquatic Biology and Ecology 1 Aquatic organisms 1 Arthropod pests 1 Avermectins 1 Biodiversity 1