Fusarium head blight (FHB) mainly caused by Fusarium graminearum is a devastating disease that causes
extensive yield and quality losses to wheat in humid and semi-humid regions of the world. The biocontrol
effect of two bacterial strains on FHB incidence, severity and deoxynivalenol (DON) accumulation in
wheat was evaluated in field trials during 2010 and 2011 at Marcos Juarez, Córdoba province, Argentina.
Bacillus subtilis RC 218 and Brevibacillus sp. RC 263 applied at anthesis period were evaluated through several
combinations of cell type, strains, inoculum density (104 and 106 cfu/ml) and physiological modification.
A significant and consistent biocontrol effect on FHB severity and DON contamination was
observed in all the evaluated treatments during both 2010 and 2011 field trials. Reduction in FHB severity
ranged 62–76% and 42–58% for 2010 and 2011 field trials, respectively. When evaluating the effect of the
combined strains (104 + 104 and 106 + 106 cfu/ml), a better biocontrol effect was observed in 2010 field
trial. After biocontrol treatments, no DON accumulation was observed in wheat heads; meanwhile in control
plots an average of 1372 lg/kg DON was detected during the two trials. FHB incidence was significantly
reduced by biocontrol treatments during the 2010 field trial but not during the 2011 field trial.
The results showed the effectiveness of the two formulated biological control agents in reducing both
FHB severity and DON accumulation by F. graminearum under semi controlled field conditions.
Fusarium head blight (FHB) mainly caused by Fusarium graminearum is a devastating disease that causesextensive yield and quality losses to wheat in humid and semi-humid regions of the world. The biocontroleffect of two bacterial strains on FHB incidence, severity and deoxynivalenol (DON) accumulation inwheat was evaluated in field trials during 2010 and 2011 at Marcos Juarez, Córdoba province, Argentina.Bacillus subtilis RC 218 and Brevibacillus sp. RC 263 applied at anthesis period were evaluated through severalcombinations of cell type, strains, inoculum density (104 and 106 cfu/ml) and physiological modification.A significant and consistent biocontrol effect on FHB severity and DON contamination wasobserved in all the evaluated treatments during both 2010 and 2011 field trials. Reduction in FHB severityranged 62–76% and 42–58% for 2010 and 2011 field trials, respectively. When evaluating the effect of thecombined strains (104 + 104 and 106 + 106 cfu/ml), a better biocontrol effect was observed in 2010 fieldtrial. After biocontrol treatments, no DON accumulation was observed in wheat heads; meanwhile in controlplots an average of 1372 lg/kg DON was detected during the two trials. FHB incidence was significantlyreduced by biocontrol treatments during the 2010 field trial but not during the 2011 field trial.The results showed the effectiveness of the two formulated biological control agents in reducing bothFHB severity and DON accumulation by F. graminearum under semi controlled field conditions.
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