Through the experiments on the effect, the most appropriate time and insecticide concentration of control of insects are discovered.

通过药效实验，找到了适宜浓度、最佳时间、具有高效低毒的农药。

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The material and method for the experiment, observation and results, growth characteristic and product, control of insects were explained respectively.

文章对耳叶马兜铃引种试验的材料与方法、试验内容与结果、生长特性及产量以及病虫害的防治，分别作了阐述。

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These include natural and organic methods to control harmful insects and weeds instead of using chemicals.

VOA: special.2009.07.14

So the native South African took the insects (Scarabaeus satyrus) into the Johannesburg planetarium where she could control the type of star fields a beetle might see overhead.

BBC: Dung beetles guided by Milky Way