close up of a leaf affected by peony tobacco rattle virus or ringspots tobravirus trv. the yellow mottling varies in severity

affected agriculture alternating areas bacterial banding bands biology blotching care chlorosis close closeup complex concentric consisting cultivated dark diagnostic different discoloration disease diseased environment farm farming field foliage green hosts infected infection leaves light microbe microbiology morphology mosaic mottling necrotic pathogen pattern peony phytopathology rattle ring ringspotcircular ringspots science severity sick spot symptom symptoms tobacco tobravirus trv varies viral virology yellow