一、症状 常见有两类:一是花叶坏死型,由烟草花叶病毒引起。病叶上呈明显的浓淡绿相间的花叶,有些品种出现褐色坏死斑,引起落花、落叶、落果,造成整株枯死。二是叶片畸形或丛簇症,多由黄瓜花叶病毒引起。初期叶脉退绿,出现斑驳、花叶,引起叶片增厚,节间缩短畸形,植株变矮,病果花斑上疣状突起。 First, the symptoms are common in two categories: First, mosaic necrosis type, caused by the tobacco mosaic virus. The diseased leaves showed obvious gray-green and white-colored mosaic leaves, and some varieties showed brown necrotic spots, causing falling, deciduous, and deciduous fruits, causing the whole plant to die. Second, leaf deformities or cluster disease, mostly caused by the cucumber mosaic virus. Initial veins dark green, mottling, mosaic, causing thickening of leaves, internodes to shorten the deformity, plant becomes shorter, the disease fruit warty verrucous processes.