查询词典 pyrethrum insecticide

For a long period of time, widely used in the production of components of an effective insecticide rotenone is mainly from the genus Derris root extract, collect rotenone from the root to dig down to two meters deep, the human cost of not only high-cost and easy caused by soil erosion, many of the genus Derris production has stopped growing, leading to the market with rotenone as the main active ingredient of the biological pesticide manufacturers shortage of raw material sources.

相当长一段时间，在生产上广泛使用的有效杀虫成分鱼藤酮主要是从鱼藤属植物中的根部提取，采集鱼藤酮的根要挖掘至地下达两米深，不仅人力成本耗费高，而且容易造成水土流失，不少鱼藤属植物的产区已经停止种植，导致市场上以鱼藤酮为主要活性成分的生物农药制造企业原料来源短缺。

Any of various usually woody vines of the genus Derris of tropical Asia whose roots yield the insecticide rotenone; several are sources of native fish and arrow poisons.

热带亚洲鱼藤属的任何一种木质藤本植物，其根产出一种属于杀虫物质的鱼藤酮；该属有几种植物当地用作鱼毒和箭毒的原料。

Diamondback moth has developed resistance to almost all kinds of insecticide.

小菜蛾对几乎所有的杀虫剂都产生了抗药性。

By use of High Speed TLC Scanner,CS-920,was used to apply droplet of insecticide solution to the dorsum of the testinsect.

测定的结果表明东台及江浦两地田间的棉蚜已经对有机磷杀虫剂—乐果产生了较高的抗药性。

In order to study the method having dual function of disinfection and disinsectization of daily -life garbage in internationally sailing ships, combination of disinfectant with insecticide and double-barrel pressure-containing sprayer were used for disinfection treatment.

研究国际航行船舶生活垃圾消毒与杀虫双重功效的处理方法，将消毒剂与杀虫剂复配，用双筒储压式喷雾器进行消毒处理，采用载体定量杀菌试验和现场试验进行了消毒效果评价。

I live in a very old house and nature seems to intrude all the time but you don't have to turn to the insecticide every time you see an earwig.

我住在一幢很旧的房子，而自然似乎总是强行挤进来，但你没必要每次一看到一个幼虫马上就拿起杀虫剂来。

Objective To provide base data for insecticide resistance monitoring in house fly,a study was undertaken to establish the susceptibility of female house fly to deltamethrin at different development days after eclosion.

目的 研究家蝇雌成虫在不同发育阶段对溴氰菊酯的敏感性变化，为家蝇的抗药性测定奠定基础。

In addition an effective insecticide spray can be used to eradicate the problem.

另外一个有效的驱虫喷雾剂，可以用来消除这个问题。

It is the first special insecticide for the red imported fire ant S. invicta, mainly absorded in stomach.

是国内首家研制成功的，以胃毒作用为主的，灭杀红火蚁的专门药剂。

It was his creation of an insecticide mainly used as a fumigant in grain stores that was responsible for the deaths of an estimated 1.2 million people.

他发明的一种主要用作粮仓熏剂的杀虫剂造成了约120万人死亡。

The work of this paper is as follows: 1. Looking back the progressing history of the linear motor, introducing the features of the elevator driven by linear induction motor, radicating the topic of this paper "the digital frequency variable control of the elevator bi-side direct driven by linear induction motor". The research of this paper covers the conventional VVVF control, space vector based VVVF control, vector control and DTC.

本文主要开展了以下几个方面的工作： 1 回顾了直线电机发展历史，电机的驱动技术演变，特别是针对直线电机的驱动，简要介绍了直线感应电机驱动电梯的优点和不同结构类型，对传统的v／f控制，基于空间矢量法的v／f控制，矢量控制，和基于电压空间矢量的直接转矩控制进行了比较，确立了本课题的研究主题：直线感应电机双边直推式驱动电梯的全数字变频控制。

The article combines with the treatment of a superficial civil air defense work to introduce how the grouting method to improve the performance of the backfill soil.

文章从治理漂浮人防工事的角度提出了注浆技术在改善回填土性质方面的应用，并详细阐述了注浆技术的施工流程。