凤山县更沙乡地处云贵高原边沿,境内石灰岩峰丛林立,平均海拔840米以上,气候温和,春暖夏凉,年平均温度为14—18℃,无霜期308天,很适合于田七生产。凤山县更沙乡田七生产中最主要的障碍是死苗严重,病苗率达11—50%,个别严重的高达80%,甚至全部死光。据查,田七的死苗是由田七立枯病[Rhizoctonia solani(kuhn)]、田七根腐病(Fusarium scirpiLamb.et Fautr)引起为主,一年生幼苗(红子苗)也部分是田七炭疽病(Colletotri- More sand Township in Fengshan County is located on the edge of the Yunnan-Guizhou Plateau, the limestone jungle territory, with an average elevation of 840 meters above sea level, mild climate, spring and summer cool, the annual average temperature of 14-18 ℃, frost-free period of 308 days, it is suitable for Tianqi production . Fengshan County, more sand Township Tian seven production is the most important obstacle dead seedlings, the disease rate of up to 11-50% of the individual, as many as 80% of individuals, and even all died out. According to the investigation, the dead seedlings of Tianqi were mainly caused by Rhizoctonia solani (kuhn) and Fusarium scirpi Lamb. Et Fautr, and the annual seedlings (red seedlings) were also partly Tiantian Anthrax (Colletotri-