rust on the pear leaves. diseases of the pear. yellow spots on the leaves. selective focus

agriculture background branch closeup color damaged detail disease diseased diseases environment foliage fruit fungal fungus garden green gymnosporangium horizontal horticulture infected infection infestation juniper leaf leaves nature orange outdoor parasite pathogen pathogenic pathology pear peartrees pest phytopathology plant rust rusty spot spots summer surface tree trellis unhealthy