山药又名薯蓣,为一年生蔓性草本植物。其块茎肉质柔滑、风味鲜美、营养丰富;且可菜药兼用、滋补食疗、加工出口;加之可食部分又生长在地下,无污染源,故倍受国内外消费者青睐。山药为高产高效作物。但生产上常因重茬连作,而遭致短体线虫病(黑斑病)的毁灭性危害,故人们 Yam, also known as yam, is an annual creeping herb. Its smooth tuber meat, delicious flavor, rich nutrition; and can serve both medicine, nourishing diet, processing exports; combined with edible part of the growth in the ground, no pollution sources, it is much favored by consumers at home and abroad. Yam is a high yield and high efficiency crop. However, the production is often due to continuous cropping, which was caused by the short-body nematode (black spot disease) devastating harm, so people