小麦全蚀病生防微生物筛选研究

通过对峙培养,从160株土壤微生物分离物中筛选出8株对小麦全蚀病菌生长有较强抑制作用的生防菌株,其中,真菌T4菌株抑菌活性最强,为63.41%;其次为S37、B22和YB024,抑菌率分别为60.37%,59.15%,53.17%。对8个生防菌株进一步进行了盆栽和田间小区防效试验,结果表明,放线菌菌株YB024对小麦全蚀病的防效最高,盆栽和小区试验防效分别达到56.90%和53.31%,优于对照杀菌剂立克秀拌种处理;其次为放线菌菌株S89,盆栽和小区试验防效分别为53.77%和36.88%;细菌菌株B22居第3位,盆栽和小区试验防效分别为52.73%和34.69%。

Screening of Biocontrol Microoganism against Wheat Take-all

8 biocontrol microorganism strains against Gaeumannomyces graminis var.tritici(G.g.t) were selected from 160 actinomycete,bacteria and fungus isolates by using confront culture each other.Among the 8 biocontrol strains,strain T4 had the highest inhibiting activity(63.41%),the inhibitory rate of S37,B22 and YB024 to G.g.t were 60.37%,59.15% and 53.17% respectively;the actinomycete strain YB024 was the best one both in pots and plots with mean control effect of 56.90%(in pot) and 53.31%(in plot),higher than that of fungicide tebuconazole;Actinomycete strain S89 came the second with mean control effect of 53.77%(in pot) and 36.88%(in plot);The third was bacterial strain B22 with mean control effect of 52.73%(in pot) and 34.69%(in plot).