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。
It provided basic technological guarantee for enlarging scope of biological control to feed artificially Sitotroga cerealella and enlarged the kinds of natural enemies by artificial breeding.
人工饲养麦蛾，扩大人工繁殖天敌的种类，为扩大生物防治范围提供基础的技术保证。
Conservation and utilization of natural enemies is the basic measure in biological control of agricultural pests.
保护利用天敌是农田害虫生物防治的基本手段。
Conclusions the endemic rebound in regions after the transmission under control or interrupted is caused by biological, natural and social factors and mainly presents as the rebound of snail status.
结论受生物、自然、社会等诸多因素的影响，传控和传阻达标地区疫情回升主要表现为螺情回升。
Conclusions the endemic rebound in regions after the transmission under control or interrupted is caused by biological, natural and social factors and mainly presents as the rebound of snail status.
结论受生物、自然、社会等诸多因素的影响，传控和传阻达标地区疫情回升主要表现为螺情回升。
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