一、典型症状黄化曲叶病毒病是系统性病害。番茄感病初期,上部叶片首先表现黄化型花叶。叶缘呈宽带型黄化,叶缘上卷,变小,变厚,叶片僵硬。感病植株生长缓慢或停滞,节间变短,植株明显矮化,茎秆上部变粗,多分枝,叶片变小变厚,畸形棒状叶质脆硬,叶片有皱褶,向上卷曲,生长点黄化,下部老叶症状不明显。因其系统浸染,上部嫩叶症状明显,下部不明显。后期发病严重时,植株生长停滞、矮化,开花后坐果困难,果实不能正常转色,导致减产或绝收。二、发病原因 First, the typical symptoms of yellow leaf curl virus disease is a systemic disease. Early tomato susceptibility, the upper leaves of the first yellow type mosaic. Leaf margin was broadband yellow, leaf margin on the volume, smaller, thicker, stiff leaves. The susceptible plants grew slowly or stagnated, the internodes became shorter, the plants became dwarfed, the upper part of the stalk became thicker, the branches more branched, the leaves became smaller and thicker, the deformity sticks became brittle, Yellow, the lower part of the symptoms of old leaves is not obvious. Due to its system disseminated, the symptoms of the upper leaves are obvious, the lower part is not obvious. Severe late stage, the plant growth stagnation, dwarf, flowering fruit after the difficulties, the fruit can not be normal color, leading to reduced production or income. Second, the cause of the disease