摘要
对5省（区）沙打旺主产区进行了病害调查,除辽宁建平之外,沙打旺黄矮根腐病在甘肃环县、宁夏盐池、陕西横山、内蒙松山和敖汉均有发生,发病率为5.7%～82.6%,病情指数为2.7～53.7。各级严重度的植株在病株中的比例因调查地点而异。与健康植株比较,病株枝条数增加16.7%～63.7%,但单株干重下降8.5%～32.9%。各地的植株密度、牧草产量、平均枝条数和单株干重均存在一定差异,其中在发病率最高的甘肃环县,植株密度、牧草产量分别与发病率和严重度均呈显著负相关（P〈0.01）。对影响发病率的因素进行了分析讨论,提出了防治该病的建议。
The survey was carried out in the main production area of standing milkvetch（Astragalus adsurgens） in five provinces of northern China.It indicated that yellow stunt and root rot of A.adsurgens occurred in Huanxian County of Gansu,Yanchhi County of Ningxia,Hengshan county of Shaanxi,Songshan Zone and Aohanqi of Inner Mongonia（except Jianping County of Liaoning province）.Disease incidences were 5.7%-82.6%,and disease indexes were 2.7-53.7.The percentages of plants with the same grade of disease severity varied from site to site.Compared with healthy plants,shoot numbers of diseased plants increased 16.7%-63.7%,and dry matter per plant decreased 8.5%-32.9%.Plant density,forage yield,dry matter and shoot number per plant at one study site were different from the others.In Huanxian County of Gansu Province disease incidence was the highest of the sites investigated and plant density and forage yield were significantly（P0.01） negatively correlated with the disease incidence and disease index,respectively.The factors associated with disease incidence are discussed,and some suggestions for disease control are given.
出处
《草业学报》
CSCD
北大核心
2011年第2期39-45,共7页
Acta Prataculturae Sinica
基金
973项目(2007CB108902)
甘肃省自然科学基金(2008GS01143)
国家牧草现代化农业产业技术体系建设共同资助
