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