The results show that the pyrethroid containing 2-imidazolidone in the structure has insecticidal activity.

This thesis is to study the insecticidal effect of PC to aphids and Plutella xylostlla.

本文研究蝉拟青霉对蚕豆蚜虫和小菜蛾的杀虫作用.

A new chemical structure category of pyrethroids was synthesized. The tests in insecticidal activity was reported.

报道了一种新型结构的拟除虫菊酯类似物的合成以及杀虫活性试验.

The insecticidal action must be considered doubtful.

这个杀虫作用是值得怀疑的.

These compounds have relatively high insecticidal activities and with low levels of resistance.

其结果表明该类化合物对测试害虫显示出较高的杀虫活性和较低的抗性比.

The gardener sprayed insecticide on the rose-bushes.

园丁给玫瑰丛喷上了杀虫剂.

Apply the insecticide sparingly.

慎用杀虫剂.

Approximately 40 % of the applied insecticide in each orchard was residual in the soil profiles.

大约每一果园施用的40%杀虫剂残留在土壤剖面中.

The insecticide was put out of the child's reach.

杀虫剂放在孩子拿 不 到的地方.

Spray the plants with insecticide.

给植物喷洒杀虫剂。

The pad is impregnated with insecticide.

垫子上满是杀虫剂。

I was in the most unbelievable snarl this morning over-of all things-a truckload of insecticide!

今天早上,真想不到,为了一卡车杀虫剂的事搞得我晕头转向!

He is spraying insecticide.

他在喷杀虫剂.

He sprayed an insecticide upon the plants to kill the insects.

他给作物喷药,以杀死害虫.

Methods: We measure the LD of flies on insecticides standard drop way.

方法: 采用点滴法测定家蝇对杀虫剂的半数致死量.

Insecticides are widely used for controlling most insect pests.

杀虫剂广泛应用于防治大多数害虫.

I have decided to specialize in plant chemicals that can be used for insecticides.

我已经下决心专门研究可以用作杀虫剂的植物中的化学物质.

They are insects'worst enemies, killing far more pests than commercial insecticides do.

它们是昆虫的死敌, 杀灭害虫的能力要比作为商品的杀虫剂大得多.

Farm workers frequently come in contact with these insecticides.

农场工人常常接触这些杀虫剂.

Systemic insecticides have shown particular promise.

内吸杀虫剂看来特别有效.

In remote regions, the air is pure and the crops are free of poisonous insecticides.

在偏远地区，空气很纯净，庄稼也不施用有毒的杀虫剂。