This paper studied the effect of oligosaccharide on controlling eggplant Corynespora leaf spot
and reducing the dose. The results indicated that spraying oligosaccharide with 100 μg·mL^-1 concentration for 3
times，the controlling effect on eggplant Corynespora leaf spot was pretty good，and the control effect was up to
62.56%. The activities of SOD，POD and CAT were obviously increased. After spraying oligosaccharide with 100
μg·mL^-1 concentration for 3 times，then spray boscalid with 50 μg·mL^-1 concentration，the control effect was
similar to that of only spraying boscalid with 100 μg·mL^-1 concentration. Both methods could obviously reduce the
disease index of eggplant Corynespora leaf spot，and the effect of reducing the dose was obviously observed.