菜农所说的番茄“龙头病”(学名为番茄曲顶病毒病 )近年来越来越重。该病常令菜农不知所措 ,叫苦不迭。其田间症状表现为 :发病早的常导致全株死亡 ;发病较晚的植株变黄或生长点直立 ,植株矮化 ,叶片变厚、变脆且向上卷曲 ,叶柄下弯 ,叶脉变紫 ,果实往往提前假熟。坐果后感病的 Vegetable farmers said the tomato “leading disease” (scientific name of tomato song virus) more and more heavy in recent years. The disease often make farmers overwhelmed. The field symptoms are as follows: the early onset of the disease often leads to the death of the whole plant; later plants yellowing or growing point upright, plant dwarfing, thickened leaves, brittle and upward curly, petiole bent, purple veins, fruits Often ahead of time cooked. Sick after fruit flu