Wettable powder for preventing and controlling wheat sharp eyespot

The invention relates to wettable powder for preventing and controlling wheat sharp eyespot, and belongs to the field of biopesticides. Effective ingredients in the wettable powder are chitosan oligosaccharide and validamycin A. The composition disclosed by the invention has good preventing and controlling effects on wheat sharp eyespot, the resistance induction of the chitosan oligosaccharide and the bactericidal activity of the validamycin A have a collaborative adding effect, so that the effect of preventing and controlling the wheat sharp eyespot is effectively enhanced, the obvious preventing and controlling effects can be achieved in early stage or later stage of pathogenesis, and the lasting period is long.