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山药是多年生藤本植物,性喜温暖,不耐霜冻。一般采用露地栽培,春种秋收,生长期180天以上,长江流域通常于4月上、中旬栽植。在栽植中山药地下害虫、根结线虫和苗期病害发生呈逐年加重之势,不利于山药优质高产。在山药播种季节,为有效控制病虫为害,在播种时要切实采取措施,防控病虫害的发生与危害,必须在播种时要抓好以下几点:注重选种。山药有一些病害主要通过土壤和种苗传播,远距离传播途径主
Yam is a perennial vine, like warm, intolerant frost. Generally open-field cultivation, spring harvest, growth period of 180 days or more, the Yangtze River Basin is usually in April, mid-planting. Under cultivation of Chinese yam underground pests, root-knot nematode and seedling disease occurred year by year increased trend, is not conducive to yam quality and high yield. In the sowing season of yam, in order to effectively control pests and diseases, it is necessary to take practical measures to prevent and control the occurrence and damage of pests and diseases during sowing. The following points must be met when sowing: Focus on selection. Some diseases of yam spread mainly through soil and seedlings, the main route of long-distance transmission