Alternaria capsici-annui was studied in this article,which caused one of the main

decay of postharvest pepper.Oligochitosan and salicylie acid were used on pepper storage

and their effects to spore of A.capsici-annui were analyzed.The results showed that

Oligochitosan and salicylie acid could have significant effect on reducing black spot

incidence of post-harvest pepper,and the optimum concentration was 75 mg·L^-1.