淮山药在生产上常因重茬连作,而遭致短体线虫病(又称黑斑病或锈病)的毁灭性危害。随着种植面积的逐年扩大,其发生危害愈来愈重,尤以多雨年份损失惨重,从而严重制约着山药生产的发展。 一、发生规律与危害症状 淮山药线虫一般体长在1毫米以内(肉眼不可见),其发育适温为25℃左右,幼虫在10℃以下停止活动,致死温度为 Yam and yam drugs often cause continuous rupture of crops in production, and was caused by short-body nematode disease (also known as black spot or rust) devastating damage. With the year-by-year expansion of planting area, its occurrence is more and more serious, especially in heavy rainy years, which severely restricts the development of yam production. First, the occurrence of the law and harm symptoms Huai yam drug body usually less than 1 mm body length (the naked eye can not be seen), its development suitable temperature is about 25 ℃, the larvae stopped below 10 ℃, lethal temperature