The more wheat stalks the adult Chrysopa septempunctata encountered, the more interference was met during the predation of C. septempunctata, which means that the predation efficiency was low when the spatial heterogeneity was complex. The coefficient of mutual interference within C. septempunctata was 0.9390, and that between C. septempunctata and Propylaea japonica was 0.8722. The frontier was greater than the latter. The correlation of competition strength(I) and the number of natural enemy (P) could be described as I = 0.0640 + 1.1127 1gP.
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