Biocontrol of Wheat Fusarium Head Blight and Fusarium Crown Rot Caused by Fusarium graminearum

Fusarium graminearumis an important pathogenic fungus in wheat,which caused Fusari umhead blight and Fusariumroot rot in wheat.F.graminearum GF1117,isolated from wheat crown rot stems collected from Jiangsu province was demonstrated to cause serious head blight and crown rot in wheat with pathogenicity test.To biocontrol F.graminearum,35antagonistic bacterial strains against F.graminearum were isolated and screened from different habitats of wheat through dilute and spread plate method and dual culture method.Then bacterial strains with obvious antagonisticity were tested in field and greenhouse to find the best strains for controlling F.graminearum.The 35bacterial strains all demonstrated the capability to control Fusarium head blight in wheat to some extent, whereas the biocontrol efficiencies were different in Fusariumroot rot experiment with susceptible and moderately resistant wheat varieties.Among them,strain 1-8displayed good biocontrol efficiencies with more than 45%in controlling these two diseases in wheat.