山药又名薯蓣，为一年生蔓性草本植物。其快整肉质柔滑、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眯。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 fast-fleshed succulent smooth, delicious flavor, rich nutrition; and can serve both medicine, nourishing diet, processing exports; combined with edible part of the growth in the ground, non-polluting sources, it is much domestic and foreign consumers Green Mi. Yam is a high-yield and high-efficient crop, but the production is often due to continuous cropping, which was caused by the short-body nematode disease (melasma) devastating harm, so people