the loquat plant affected by a plant disease

affected agricultural agriculture agronomic agronomical agronomy attacked bacteria bacterial black caused chlorosis chowing curl dead deformans disease diseased eriobotrya fire food fruit fungi fungicide green greenhouse japan japonica leaf loquat lose lost medlar mycology natural nature necrose necrosis pathogen pathology pesticide phytopathology phytopharmacy plant protection quince showing some spot spots symptom symptoms tissue treatment