Biological Control 1 Biological control 1 Biological control agents 1 Disease resistance 1 Forests and Forest Trees (Biology and Ecology) 1 Fungal diseases 1 Fungi 1 Host Resistance and Immunity 1 Hyperparasitism 1 Infection 1 Melampsora 1 Melampsoraceae 1 Microbial Life Cycles, (New March 2000) 1 Natural enemies 1 Plant disease control 1 Plant diseases 1 Plant pathogenic fungi 1 Plant pathogens 1 Poplar 1 Poplars 1 Populus 1 Rust diseases 1 Salix 1 Taxonomy 1 Taxonomy and Evolution 1 Viral, Bacterial and Fungal Diseases of Plants, (New March 2000) 1 Willows