citrus greening hlb huanglongbing yellow dragon diseased leaves and fruits

agriculture america and asian background bacteria bright candidatus citri citrus closeup color deadly destruction diaphorina disease diseased dragon farm farming food freshness fruits garden global green greening growth heavily hlb huanglongbing industry infected leaf leaves liberibacter natural nature orange orchard organic pathogen phytopathology plague plant psyllid pysillid quarantine south threats tree trees venezuela yellow