病毒病常分为几大类，即花叶病，黄化病，斑驳或条斑。
Viruses are often classified into broad categories as mosaics, yellows, mottles, and streaks.
发生在宁夏甜菜上的一种病毒病的病株叶丛主要表现为黄化、焦桔和叶脉黄化坏死。
A virus disease of sugar beet occurred in Ningxia showing symptoms of yellows, parch blight and necrotic yellow vein of foliage leaves.
番茄黄化曲叶病是热带、亚热带地区最具毁灭性的番茄病毒病之一。
Tomato yellow leaf curl disease is the most destructive virus disease of tomato in tropical and subtropical regions.
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