小麦赤霉病菌抗药性群体动态及其治理药剂

Dynamics of resistant population of Fusarium graminearum to carbendazim and substitutable fungicide screening

198 6～ 2 0 0 1年 ,以 10 μg·mL-1多菌灵作为鉴别剂量 ,在PSA含药平板上监测了浙江省、江苏省、上海市和湖北省13个县市共 194 91个小麦赤霉病菌菌株对多菌灵抗药性的群体分布与发展动态。结果表明 ,江浙沪地区的小麦赤霉病菌群体中存在着不同比例的抗药性菌株 ,湖北未发现抗药性。可控制抗药性群体发展的杀菌剂筛选结果表明 ,戊唑醇、咪鲜胺与多菌灵不具交互抗性 ,对赤霉病抗药和敏感菌株均有较好的防治效果 ,使用这两种杀菌剂可阻止对多菌灵抗药病原群体的发展。作者认为戊唑醇和咪鲜胺作为多菌灵的替代药剂单独使用或与多菌灵混配使用 。

A total of 19 491 isolates of Fusarium graminearum causing wheat scab were collected from 13 counties in Shanghai and Zhejiang,Jiangsu,and Hubei provinces during 1986 to 2001 and tested for carbendazim(MBC)resistance.In the resistance bioassay,the distinctive concentration for resistance and sensitivity is 10 μg·mL? ? of MBC.The results showed that the resistant population with high degree of MBC resistance of F.graminearum has developed in Shanghai and Zhejiang,Jiangsu provinces,and no resistant isolate was found in Hubei.Efficiency tebuconazole,diniconazole,prochloraz and thiram fungicides against MBC resistance of the pathogenic population was determined both in vitro and in vivo.Tebuconazole and prochloraz were best to combat the MBC resistant and sensitive populations.Therefore,these two fungicides were suggested to be used as a alternation to control the development of the MBC resistance in F.graminearum. 