Fusarium head blight (FHB) is a devastating disease of cereal crops which can cause huge losses in epidemic years.In addition to the yield loss caused by the disease, the contamination of infected grains with mycotoxins poses a serious threat to human and animal health.Although a number of Fusarium spp.can cause FHB, Fusarium asiaticum (Fa)and F.graminearum (Fg) are the primary causal agents of FHB in China.