杀幼虫的

We are using larvicides and insecticide to keep the mosquito population down.

我们正在使用的杀幼虫剂和杀虫剂把蚊子下来。

The poison activity, stomach toxicity action and nonselective food refusal activity of extracts and fractions obtained by extracting the stem of Mirabilis jalapa L against the 4th instar larvae of Pieris rapae L, with 3 polarity solvents（petroleum ether, chloroform and ethanol）were determined by the methods of feeding, leaf-sandwich and leaf dish.

用饲喂法、叶片夹毒法、叶磲法测定了紫茉莉茎的3种极性溶剂提取物及萃取物对菜粉蝶幼虫的毒杀活性、胃毒作用、非选择性拒食活性。

The pyrethrin insecticides had lower toxicities to this insects, and the the corrected mortality of avermectin and the chitin synthesis inhibitors is lower than 40%, which's dose is 50 mg/kg.

微生物源杀虫剂阿维菌素和几丁质合成抑剂灭幼脲、杀铃脲和除虫脲对细胸金针虫幼虫的毒力较低，在剂量为50mg/kg土时，其校正死亡率均在40%以下。

Objective:To study the toxicity and histomorphological changes of Aedes albopictus larvae by alpha-terthienyl.

目的： 研究α-三噻吩对白纹伊蚊幼虫的毒杀作用及其组织学的改变。

As Bs grows, it produces binary toxin, Mtx and Cry48Aa/Cry49A, which have specific toxic effects on a variety of mosquito larvae. It is hence widely used in biological vector and mosquito control and considered a larvicidal solution that is non-toxic to human, animal, poultry and aquatic life and environmentally friendly.

Bs在生长发育过程中能产生对不同蚊幼虫具有特异性毒杀作用的二元毒素、Mtx毒素和Cry48Aa/Cry49A毒素，广泛应用于病媒蚊虫的生物控制中，被认为是一种对人、畜、禽、水生生物无毒，不污染环境的生物杀蚊幼制剂。

The preliminary bioassay showed that some title compounds exhibit good or moderate larvicidal activity to the Mythimna separata and induce a premature, abnormal, and lethal larval molt.

初步生测结果表明R^2为对氯取代的目标化合物对3龄粘虫表现出较好或中等的杀幼虫活性。

The results showed that no obvious contact toxicities against the 3rd instars larvae of Mythimna separata Walker were observed in all treatment, and only the extract of Euonymus japonicus exhibited notable stomach toxicity.

采用微量点滴法和载毒叶片饲喂法测定30种药用植物乙醇提取物对粘虫3龄幼虫的触杀、胃毒以及拒食活性，结果表明供试样品在50 mg﹒mL~(-1)浓度下，冬青卫矛Euonymus japonicus Thunb。

Five species of solvents, namely, acetone, ethyl acetate, ether, trichloromethane and petroleum ether were selected to obtain extracts from Portulaca oleracea L. with microwave assistance and the biological activities of each extract was tested against Plutella xylostella L.

在微波加热条件下，以丙酮、乙酸乙酯、乙醚、三氯甲烷和石油醚为溶剂对马齿苋干粉进行提取，试验了各溶剂提取物对小菜蛾幼虫的触杀、胃毒及拒食活性，确定了石油醚提取物触杀作用的LD50。

Objective To delay the occurrence and development of resistance of mosquito to chemical insecticides,the efficacy of Propoxur mixed with synergists against Culex pipiens pallens larvae collected fromTengzhoucity,Tai'an city and Tangkou township of Jining City in Shandong province,was observed.

目的 观察残杀威与增效剂复配对山东省不同地区现场淡色库蚊幼虫的杀虫效果，保护和有效使用杀虫剂提供科学依据方法采用WHO生物测试法。

Objective To delay the occurrence and development of resistance of mosquito to chemical insecticides,the efficacy of Propoxur mixed with synergists against Culex pipiens pallens larvae collected fromTengzhoucity,Tai'an city and Tangkou township of Jining City in Shandong province,was observed.

目的 观察残杀威与增效剂复配对山东省不同地区现场淡色库蚊幼虫的杀虫效果，为保护和有效使用杀虫剂提供科学依据。方法采用WHO生物测试法。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了