Fungal pathogens are important natural biological control agents of aphids.
病原真菌是蚜虫的重要自然控制因子。
Agriculture, as a complex process of biological reproduction under natural or manpower control condition, is affected by such factors as climate, soil and natural resources to a great extent.
农业生产作为人类利用生物在自然环境或人工调控环境条件下进行物质再生产的一个复杂过程，在相当大的程度上受到气候、土壤、自然资源禀赋等条件的影响。
Natural enemies, especially species of Torymidae, are considered as efficient biological control agents.
它有许多天敌，尤其是长尾小蜂，被认为是有效的生物防治手段。
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