【摘要】 对松突圆蚧与松突圆蚧花角蚜小蜂的种间关系用微分方程组模型进行了研究。通过模型拟合，得出各调查区的松突圆蚧和松突圆蚧花角蚜小蜂种群的平衡密度。在放蜂时间较长的调查区中害虫和天敌种群处于低密度共存的状态，这对天敌的保护和助迁具有实际意义。更多还原

【Abstract】 A set of differential equations was established to describe the interaction between Hemiberlesia pitysophila Takagi and Coccobius azumai Tachikawa based on the investigation data in various fields. Coexistance of pest and its parasite under low population densities in fields with longer parasite-releasing period was indicated, which was quite important for the protection and transference of natural enemy.更多还原