摘要
调查内蒙古赤峰沙打旺根腐病发生情况 ,结果表明沙打旺株龄越高 ,根腐病发病率和严重度越高 ,3～ 5株龄发病率达 10 0 % ,而病情指数则在 85以上 ;4株龄和 5株龄沙打旺的返青率较低 ,分别为 6 8.8%和 5 4 .8% ;分枝返青率不到30 %和 2 0 %。依据柯赫氏法则自典型病株分离病原菌 ,经鉴定 ,致病菌株为茄病镰刀菌和尖孢镰刀菌。对 19种植物进行温室接种实验 ,结果表明两菌株均对沙打旺、鹰嘴紫云英、蒙古黄芪、达呼里黄芪、草木樨状黄芪等黄芪属植物有致病性。寄主范围试验表明 ,病原菌初步定为沙打旺茄病镰刀菌黄芪专化型 (Fusarium solani f.sp astragali Sad 1)和尖孢镰刀菌黄芪专化型 (Fusarium oxysporum f.sp astragali Sad 2 )
An investigation on milk vetch (Astragalus adsurgens) root rot was conducted in Chifeng City, Inner Mongolia Autonomous Region. The result shows that with the plant advances in age, its pathogenicity grows. A plant of 3 to 5 years of age succumbs to the disease at an 100% rate, and the disease index reaches 85 or even higher. The re-greening rate in spring of a 4-or 5-year-old milk vetch plant is as 68.8% or 54.8%, and their tillers re-greening rate is 20%～30% only. Pathogenicity tests on 19 species of Astragalus in greenhouse show that two fungal cultures isolated from a diseased milk vetch plant could infect A. adsurgeus, Medicago varia Martin cv., and Melilotus ofliciralis. Based on the morphological and pathogenicity study, the two isolates which caused root rot of A. adsurgens are identified as Fusarium solani f. sp. astragali, and Fusarium oxysporum f. sp. astragali.
出处
《草地学报》
CAS
CSCD
2004年第4期285-288,297,共5页
Acta Agrestia Sinica
