pear tree branch with green leaves affected by a fungal disease rust. a branch of a rusted pear tree. pest control and protection

agriculture background branch closeup color damage danger detail disease diseased flora foliage fruit fungi fungicide fungus garden green gymnosporangium heteroecious infected infection infestation leaf leaves mycelium natural nature orange outdoor parasite pathogen pathogenic pathology pear pest phytopathology plant rust rusty sabinae shrub spores spot summer treatment tree unhealthy yellow