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1997年7月8日至8月29日系统调查了夏玉米田主要害虫及天敌的种群数量动态,并利用相对多度、丰富度、优势度、生态优势度、多样性指数和均匀度分析了其群落结构和动态。结果表明:(1)在棉区夏玉米田共有害虫和天敌59种,其中害虫24种,天敌35种。(2)截形叶螨为优势种,其优势度指数为0.6459～0.9924。(3)8月中旬以后群落多样性指数(H′)和均匀度(J)较大,分别为0.7327～0.9378和0.5242～0.6986;但此期以前,H′与J均较小,应注意防治。(4)害虫及天敌在时间上的同步性和在空间上的同域性均强,为保护利用自然天敌控害提供了依据。最后分析提出了以保利利用天敌为主的综合防治策略和措施。
From July 8, 1997 to August 29, 1997, the population dynamics of major pests and natural enemies in summer corn fields were systematically investigated. The relative abundance, abundance, dominance, ecological dominance, diversity index and evenness were analyzed Its community structure and dynamics. The results showed that: (1) There were 59 species of pests and natural enemies in summer maize field, including 24 pests and 35 natural enemies. (2) Tetranychus urticae was the dominant species, and its dominance index was 0.6459 ~ 0.9924. (3) After mid-August, the community diversity index (H ’) and evenness (J) were larger, ranging from 0.7327 to 0.9378 and 0.5242 to 0.6986, respectively. However, before this period, H’ . (4) The synchronization of pests and their natural enemies in time and their strong homology in space provided the basis for the protection and control of natural enemies. In the end, the paper puts forward the integrated prevention and control strategies and measures that mainly use natural enemies.