Abstract: Relationships among the spatial distribution patterms of Helicoverpa armigera, and its matural enemies Propylaea japonica and Chrysopa sinica were studied through field investigation. The result showed that the correlation coefficients of quantity in vertical distribution between H. armigera and P. japonica, and H. armigera and C. sinica were 0.5696 and 0.8620 in June,0.8300 and 0.9282 in July,and 0.9083 and 0.8201 in August,with all significant differences except for P. japonica in June. The correlation coefficients of spreading coefficient and Kuno index were 0.8211 and 0.7791 between H. armigera and P. japonica in vertical patterns,and 0.7925 and 0.5228 between H. armigera and C. sinica in horizontal patterns.

Key words: Helicoverpa armigera, Propylaea japonica, Chrysopa sinica, Spatial distribution, long-term experiment, chemical fertilizer combined with organic fertilizer application, N and P balance, eco-economic benefit