medlar scab

agricultural agriculture agronomy aliment alimentation brown browning chlorose chlorosis contagious danger dead death disease diseased epidemics epidemy feed food fruit fungi fungus fusilcocum green health healthy japanese leaf lesion loquat medlar mosaic mycological mycology natural nature necrose necrosis nutrition orchard pathogen pathology photosynthesis phytopathology plant produce product production protection safe safety scab security sound spolocea spot symptom symptoms tissue tree unsound venturia yellow yellowing