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莴苣花叶病在山东普遍发生,其中以泰安等地比较严重。苗期和发棵前期发病的损失最大;人工接种证明,3叶期和7叶期感染的病株全无食用价值。在测定的15科63种植物中,有4科14钟植物表现感病。种子带毒率为1—2%,不同品种和不同生育期感染的病株种子带毒率有很大差异,开花后发病的植株种子不带毒。室内测定,萝卜蚜(Rhopalosiphum pseudobrassicae),棉蚜(Aphis gas-sypii)和大戟长管蚜(Macrosiphum euphorbiae)均可传毒。桃蚜取食15秒钟即可获毒或传毒,单头蚜传毒率为40%左右,获毒1次可连续传毒2—3株。
Lettuce mosaic disease occurs in Shandong, including Tai’an and other places more serious. Seedling and the incidence of the most premature onset of the loss; artificial inoculation proved that the 3-leaf stage and 7-leaf stage infected with no edible value. Of the 15 families and 63 species tested, 4 families and 14 plants showed susceptibility. Seeds with a 1-2% rate of seed poisoning, different varieties and different growth stages of infected strains of seed infection rates are very different, the incidence of flowering plants without poisoning. Laboratory tests, Rhopalosiphum pseudobrassicae, Aphis gas-sypii, and Macrosiphum euphorbiae were all toxic. Peach aphid feeding 15 seconds to get poison or poison, aphid poisoning rate of about 40%, a poison can be a continuous transmission of 2-3 strains.