1College of Horticulture and Forestry，Northeast Agriculture University，Key Laboratory for Northeast Region Horticulture Crop Biology and Germplasm Creation，Ministry of Agriculture and Rural Afairs，Harbin 150030，Heilongjiang，China；2Yichun City Agricultural Comprehensive Service Center，Yichun 142800，Heilongjiang，China；3Daqing City Agriculture Technology Extension Center，Daqing 163000，Heilongjiang，China
Abstract：Taking pepper monoculture as the contrast（CK），this experiment planted perilla between pepper ridge double lines with different densities（plant spacing 20，40，60 cm）；studied the effects of different perilla intercropping densities on pepper blight occurrence and plant growth，so as to explore a safe and effective blight control measure．The results showed that rational perilla intercropping with pepper could effectively control pepper blight．And the disease index and incidence rate were significantly reduced．Along with the decrease of perilla intercropping density（i.e. intercropping plant space was increased），the population crown environment and soil environment of each treatment were improved．The activities of 3 enzymes SOD，POD，PPO and chlorophyll content were all increased．While，the pepper blight disease index and incidence rate were all reduced. The growth vigor of pepper plant was strengthened，yield and quality were improved．Among them，the intercropping treatment with 60 cm spacing of perilla（Z3）had the best effect．The control efficiency of pepper blight reached 78.23%．Pepper yield increased by 53.8%．Also the contents of soluble protein，soluble sugar and VC in fruit were significantly increased．
