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病毒病是莴苣、莴笋的主要病害,普遍发生,目前国内外均没有理想的药剂防治。应以预防为主,采取以农业措施防治和及时防治蚜虫。 病毒病是由病毒侵染引起,田间主要通过蚜虫传毒,农事操作汁液接触传染。病株是随气温上升而增多,当旬平均气温达18℃以上和长时间缺水,病毒病发展迅速。高温干旱,肥料不足,管理粗放,植株生长弱,杂草
Virus disease is lettuce, the main lettuce disease, widespread, there is no ideal medicine at home and abroad prevention and treatment. Should be based on prevention, to take agricultural measures to prevent and control aphids in a timely manner. Virus disease is caused by the virus infection, the field mainly through aphids poisoning, agricultural operation of juice contact infection. The diseased plants increase with the temperature rise, when the average temperature of ten days reaches above 18 ℃ and prolonged water shortage, the virus disease develops rapidly. High temperature and drought, insufficient fertilizer, extensive management, weak plant growth and weeds