论文部分内容阅读
病毒病是莴苣的主要病害,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,采取农业防治和及时防治蚜虫。高温干旱,肥料不足,管理粗放,植株生长弱,杂草多、蚜虫多,发病重。症状识别苗期被害,在第一片真叶上产生浅绿色或黄白色不规则的斑驳,叶缘不整齐或有缺刻。第二、三片真叶则有明脉,后出现黄绿相间的斑驳或花叶。成株期被害,症状与苗期相似,但有的叶片皱缩,细脉变褐,并有褐色坏死斑点,有的叶缘内卷,并有矮化现象。
Virus disease is the main disease of lettuce, and it is a common occurrence. At present, there is no ideal medicament prevention and treatment at home and abroad. Therefore, prevention should be the main way to prevent and cure aphids in agriculture. High temperature and drought, lack of fertilizer, extensive management, plant growth is weak, weeds and more, aphids and more, the incidence of heavy. Symptoms identify the seedlings were killed, in the first true leaves produce light green or yellowish white irregular mottled, irregular leaf margin or nicked. Second, three true leaves are Ming veins, yellow and green mottled mosaic or mosaic. Adult plants were killed, the symptoms and seedling similar, but some folds, veins brown, and brown necrosis spots, and some margin of the leaf margin, and dwarf phenomenon.