Application of chitosan oligosaccharide for resisting premature senility

The invention relates to an application of chitosan oligosaccharide for resisting premature senility and a method and particularly provides an application of a pesticide compound containing the chitosan oligosaccharide for resisting premature senility. The pesticide compound is characterized in that the weight percent of the chitosan oligosaccharide in the pesticide compound containing the chitosan oligosaccharide is 0.004%-0.0235%. The chitosan oligosaccharide provided by the invention is capable of efficiently controlling the premature senility of crops, and the stable yield and increment for agriculture are ensured.