The effect of several pesticides on wheat aphids and their natural enemies as well as on pests and natural enemies population in maize field was tested indoors and in the field.
在室内和田间测试了几种杀虫剂对麦蚜、天敌及后茬玉米田主要害虫与天敌种群的影响。
This paper records the natural enemies of pests in Xichang farmlands, including 96 parasitic insects and 81 predatory insects.
本文记录了西昌农田害虫天敌寄生性昆虫96种，捕食性昆虫81种。
The article studied the influence of ducks in a rice-duck complex ecosystem as well as its natural enemies and diseases, insects, weeds and pests.
研究鸭子在稻鸭复合生态系统中对蜘蛛及病、虫、草害的影响。
The results showed that: (1) There were 59 species of insect pests (24 species) and natural enemies (35 species) in this corn field.
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。
The main natural enemies of the pests on tobacco of Yunnan and their role on natural control of the pests were reviewed.
介绍了云南省烟草主要害虫天敌资源和天敌昆虫的自然控制作用。
And the species of insect pests in the city together with the insects as the pests' natural enemies hare been checked up.
初步摸清了秦皇岛市区园林害虫种类及天敌昆虫资源情况。
Method: the kinds and number of pests and their natural enemies were investigated at regular intervals and on the fixed trees.
方法：在枸杞生长季节调查枸杞害虫及其天敌种类，定期、定点调查害虫及天敌发生数量。
Transgenic insect-resistance hybrid poplar 741 had negative effect on target and non-target phytophagous pests, but had positive effect on natural enemies and neutral arthropod.
研究表明，转基因741杨对目标昆虫和非目的植食性害虫存在负效应，而对天敌和中性节肢动物组成和发生无明显负作用。
There is a grey positive correlation between Numbers of the total individuals and the total species, individual Numbers of the pests and their natural enemies in a arthropod community.
在一个节肢动物群落中总个体数与种类数、天敌总个体数与害虫总个体数具有灰正相关关系。
Methods:The kinds and number of the pests and its natural enemies were investigated at fixed plants.
方法：在枸杞生长季节调查枸杞害虫及其天敌种类，定期、定点调查害虫及天敌发生数量。
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。
Plant can release secondary compounds for information transfer, who played such as the role of duce pollination and natural enemies of plant eaters as well as warned of similar attacks have pests.
植物能够释放以其挥发性次生物质构成的气味进行信息传递，起到引诱授粉者、植食者天敌，警告附近同类有病虫侵袭等作用。
Plant can release secondary compounds for information transfer, who played such as the role of duce pollination and natural enemies of plant eaters as well as warned of similar attacks have pests.
植物能够释放以其挥发性次生物质构成的气味进行信息传递，起到引诱授粉者、植食者天敌，警告附近同类有病虫侵袭等作用。
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