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chemical insecticides
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  化学杀虫剂
     Impact of 12 Chemical Insecticides on Conidial Germination of 3 Entomogenous Fungi
     12种化学杀虫剂对3种虫生真菌孢子萌发影响的研究
短句来源
     The index of population trend in treatment of spraying chemical insecticides was 7.20,The index of population trend would increase in 1.43 times against that in control.
     施用化学杀虫剂的种群趋势指数()为7.20,干扰作用控制指数为1.43,即种群趋势指数将增长为对照的1.43倍。
短句来源
     A Study on the Resurgence of Cotton Bollworm Induced by Chemical Insecticides
     化学杀虫剂诱发棉铃虫再猖獗的研究
短句来源
     The research showed that it is practicable to bring the coordinated use of B. t and chemical insecticides in IPM system.
     这一研究为在IPM系统中将微生物杀虫剂和化学杀虫剂协调使用缓解棉铃虫对拟除虫菊酯类杀虫剂的抗性提供理论基础。
短句来源
     The LT50 values ranged from 2 d to 5 d at the dosages of 1. 31 -16. 48 conidia/mm2. The estimated dose-effect parameter β was 1. 82. a high value for a microbial control agent and equivalent to that of some chemical insecticides.
     时间—剂量—死亡模型的剂量效应参数β值高达1.82,几乎与一些化学杀虫剂对害虫的同一参数估计值(1.2~4.5)接近。
短句来源
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  化学农药
     The result showed that the effects of BtA 800x 3—12days after spray to aphid were 85.96%, 92. 98%, 91.22%, much higher than those 4 chemical insecticides.
     药后3d、5d、12d的虫口减退率平均可达85.96%、92.98%、91.22%,明显高于其它4种化学农药
短句来源
     Using high efficient biocide BtA and 4 chemical insecticides to control cowpea aphid in a field trial was conducted.
     应用高效生物杀虫剂BtA和4种常用化学农药对豇豆蚜虫(Cowpea aphid)进行田间防治药效对比试验,结果表明BtA 800倍液对豇豆蚜虫有很好的防治效果。
短句来源
     Field application indicated that 0. 4 billion nematodes/667m2 of use amount can keep the damage rate of beet seedlings under 15.1%, this result was obviously higher than those of chemical insecticides.
     大田防治结果,每667m2施用4亿头线虫,幼苗被害率可控制在15.1%以下,效果明显高于某些化学农药
短句来源
     ational use of chemical insecticides, protection and utilization of natural enemies. The purpose of integrated control was to heighten the benefits and effects of ecology, economics and society.
     综合防治的策略是“从生态学、经济学和环境保护学的观点出发,协调使用三项技术措施,即以农业防治为基础、合理使用化学农药,保护利用自然天敌,达到提高经济效益、生态效益和社会效益的目的。”
短句来源
     This virus belongs to subgroup B of Baculovirus, terms IcGV. Bioassay conducted in the laboratory showed that the medium lethal concentration LC_(50) was 1×10~(-4.36). Field tests showed that the mortality of the larvae may reach 86—100% spraying with the virus suspension, the IcGV was better than the chemical insecticides Malathion.
     室内感染3龄幼虫的LC_(50)为1×10~(-4·36),野外用3000—5000倍病虫尸匀浆液喷洒,枣刺蛾幼虫下降可达86—100%,杀虫效果比化学农药马拉硫磷好。
短句来源
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  化学杀虫剂使用
     Without chemical insecticides in vegetable fields, the index of population trend (I) of dominant insect pest decreased greatly, the control effect of natural enemies on major insect pests increased, the diversity index of arthropod increased at the same time.
     停止化学杀虫剂使用后 ,菜田优势害虫种群趋势指数降低 ,天敌的控制作用明显增强 ,节肢动物多样性指数增大。
短句来源
     The effect of chemical insecticides on the structure and diversity of arthropod communities in various vegetable fields and the restoration of their biodiversity after stopping application of chemical insecticides were studied.
     探讨了化学杀虫剂对菜田节肢动物群落结构和多样性的影响以及停止化学杀虫剂使用后多样性的恢复。
短句来源
     When the applications of chemical insecticides were stopped in vegetable fields, the index of population trend ( I ) of dominant insect pests decreased greatly, the control effect of natural enemies on major insect pests increased, and the diversity index of arthropod increased at the same time.
     停止化学杀虫剂使用后 ,优势害虫的种群趋势指数明显降低 ,天敌对主要害虫的控制作用增强 ,节肢动物多样性指数增大。
短句来源
  “chemical insecticides”译为未确定词的双语例句
     When SLNPV of 10~(6)PIB/mL was added to chemical insecticides,the synergic ratio is 2.75 and 2 at the fifth day,LT_(50)is shortened by 10.472 d and 6.402 d at the seventh day.
     终浓度为5×106PIB/mL的SLNPV农药稀释液,5 d的毒力倍数为2.75和2,其理论值LT50分别缩短10.742 d和6.402 d。
短句来源
     Methods Using A,B,C,D four kinds of method for killing cockroach to each xingshisu,25K,25G,22 type,using chemical insecticides to investigate the density of cockroaches and counting the killing rates.
     方法对各新时速、25K型、25G型、22型的4个车底用A、B、C、D 4种灭蟑方案对应作业,用药激法调查作业前后蟑螂密度,计算杀灭率。
短句来源
     1. chemical insecticides: field tests of six insecticides to control alfalfa thrips shows that six insecticides gave significant control, especial 25% thiamethoxam 5000x、10000x、15000x and 1.8% abamectin 1000x, 3 days after treatment, the control level attained were 85.63~93.30%.
     1.化学药剂:6种杀虫剂防治苜蓿地蓟马的药效防治试验,结果表明,6种杀虫剂对苜蓿地的蓟马均有显著的防治效果,其中以25%阿克泰5000倍液、10000倍液、15000倍液和1.8%虫螨克1000倍液防效最好,药后3天的防效达85.63%~93.30%。
短句来源
     Influence of 15 Chemical Insecticides on Conidial Germination of 3 Entomogenous Fungi
     15种杀虫剂对3种虫生真菌孢子萌发的影响
短句来源
     Advances in study on resistance of homopteran pests to chemical insecticides
     同翅目害虫抗药性研究进展
短句来源
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  chemical insecticides
As the farmers gain more experience with both agronomic practices and chemical insecticides, they are likely to rely more heavily on cultural practices and less on insecticides to manage PTM.
      
Use of chemical insecticides has created a control problem because of the development of resistance.
      
By contrast cotton growers are beset with problems of pest resistance to chemical insecticides.
      
The compatibility of the entomopathogenic fungus Lecanicillium muscarium and chemical insecticides used to control the second instar stages of the sweetpotato whitefly, Bemisia tabaci, was investigated.
      
The use of both control agents might be helpful in reducing the selection pressure for resistance to chemical insecticides, thereby delaying or preventing the build-up of resistant populations in greenhouses.
      
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The pine caterpillar is one of the most important pests of pine trees in China. Be-cause there are some disadvantages to apply chemical control of this pest, an urgentneed of using microbial methods as a supplementary measure is evident. The results ofthe preliminary test are very promising. The results are as follows: 1. The application of B. thuringiensis var. thuringiensis to control the pine cater-pillar seems to be very effective. In future it may develop into a new and powerfulweapon in pest control work....

The pine caterpillar is one of the most important pests of pine trees in China. Be-cause there are some disadvantages to apply chemical control of this pest, an urgentneed of using microbial methods as a supplementary measure is evident. The results ofthe preliminary test are very promising. The results are as follows: 1. The application of B. thuringiensis var. thuringiensis to control the pine cater-pillar seems to be very effective. In future it may develop into a new and powerfulweapon in pest control work. 2. The concentrations of the bacterial suspensions should be raised with the in-crease of larval instars. The range is approximately between 15×10~6--2.7×10~8 sporesper c.c. 3. High temperature resulted in a quick infection and death of the larvae. There-fore, the application of this method in June, July and August will give better results,though in cold and wet seasons, for example in March and April in central China, thecontrol is also effective. 4. The applications of B. thuringiensis var. thuringiensis with very dilute concentra-tions of chemical insecticides, such as 666, DDT and Diptrex, will give quicker andbetter results. This is a promising method. Dusting is valuelessly.

本文系应用苏云金杆菌(Bacillus thuringiensis var.thuringiensis)粉制剂防治马尾松毛虫(Dendrolimus Punctatus Walk.)的试验结果,试验表明此菌的致病力高,防治效果好,大有应用的前途。应用时,菌剂的浓度应随幼虫龄期的增加而递增,含孢子数的有效幅度为1,500-27,000万/c.c.死亡率可达90-100%。此菌如与稀浓度化学药剂(如666、DDT、敌百虫)混合使用,防治抵抗力较强的4-7龄幼虫,效果更好。

The European corn borer(Ostrinia nubilalis)is one of the major pest insects of grain crops in Hopei Province.In the past satisfactory control may be achieved by using granulated insecticides at the late whorl stage of the corn.But in recent years the infestation by this pest has aggravated in districts where the cultivation system has changed.This paper reports the occurrence and the integrated control of this insect in Yung-ching County,1974.The results of our study may be summarized as follows.1.Our field...

The European corn borer(Ostrinia nubilalis)is one of the major pest insects of grain crops in Hopei Province.In the past satisfactory control may be achieved by using granulated insecticides at the late whorl stage of the corn.But in recent years the infestation by this pest has aggravated in districts where the cultivation system has changed.This paper reports the occurrence and the integrated control of this insect in Yung-ching County,1974.The results of our study may be summarized as follows.1.Our field observations on the development of the European corn borer have shown that when the summer corn is sown between rows of growing wheat,the eggs of the second generation of the pest will be deposited mainly on corn plants at the tasseling-silking stage.When the summer corn is sown after the wheat is harvested as before,the eggs will be equally divided between the corn plants at late whorl stage and those at the tasseling-silking stage.This is the reason why the damage on corn by this insect at tasseling-silking stage is increased in recent years.2.Several insecticides and their mixtures have been tested and some of them are found to be good substitutes for the organochlorine insecticides used before.The effectiveness of 1%,0.5% and even 0.25% granulated E605 were found higher or a little lower than the 5% granulated DDT When 0.5% or 0.1% E605 is added to the soil granules of the white muscardine fungus(Beauveria bassiana)(1:20),the effectiveness is higher or a little lower than the 5% DDT granules respectively.0.1% and 0.2% Phoxim granules are more effective than 0.1% 666 granules.C-9140 soil granules(1:10)are as effective as 5% DDT granules.3.According to our experience the integrated control of the European corn borer in our district may include the following steps:destruction of the host plant debris in the winter,attracting and killing the adult moths by light traps,and the combined use of the fungus and chemical insecticides.

玉米螟是河北省主要粮作害虫。过去在玉米心叶期应用颗粒剂防治已可基本控制为害。近年来一些地区耕作改制后玉米螟的为害又有所回升。我们1974年在永清县对耕作改制后玉米螟的发生进行了系统调查,采用农业、物理、化学、生物等措施,进行综合防治试验、示范,初步明确了以下几个问题: 1.通过对玉米螟发生期及生活史的系统调查,初步澄清耕作改制后,夏玉米由收麦后平播,改变为麦垄套播,玉米螟第二代卵,主要产在抽雄吐丝期,而麦茬平播夏玉米则心叶期和穗期各半。这点是近年穗期螟害加重的主要原因。 2.通过试验、示范,找出代替有机氯治螟的药剂。如1%、0.5%、0.25%1605颗粒剂效果高于或略低于5%DDT颗粒剂;白僵菌20倍加0.5%1605,或白僵菌20倍加0.1%1605颗粒剂,效果分别高于或稍低于5%DDT颗粒剂。0.1%、0.2%辛硫磷颗粒剂效果高于0.1%六六六颗粒剂。2.5%螟铃畏颗粒剂,效果与5%DDT颗粒剂相仿。 3.通过采用农业、物理、化学、生物等综合措施,我们认为本地玉米螟的综合防治概括为:“越冬防治,处理秸秆,诱杀成虫,压低虫源;田间防治,菌药结合,安全经济,控制为害”。

This paper reports the results of studies on the nuclear polyhedrosis virus-of the cotton bollworm Heliothis armigera.The virus was isolated in 1974 from dead boll-worms collected from cotton fields in Chinchow district of Hupeh Province.It was designated as VHA-273.It is observed that the polyhedra are hexagonal,pentahedron,cubical or irregular in shape,varying from 1.25 to 5.0 p in diameter.Serious pathological changes were in the fat-body,epidermis,tracheal matrix and other tissues of the diseased insects...

This paper reports the results of studies on the nuclear polyhedrosis virus-of the cotton bollworm Heliothis armigera.The virus was isolated in 1974 from dead boll-worms collected from cotton fields in Chinchow district of Hupeh Province.It was designated as VHA-273.It is observed that the polyhedra are hexagonal,pentahedron,cubical or irregular in shape,varying from 1.25 to 5.0 p in diameter.Serious pathological changes were in the fat-body,epidermis,tracheal matrix and other tissues of the diseased insects and the former two seemed to be the most susceptible tissues.The muscle bundles were not affected.Our bioassay showed that the susceptibility of the larvae to the NPV varied with dosage,larval instar and temperature.The first and second instars were the most susceptible stages;and their mortality rates at 1×106 PIBs/ml were 85% and 80% and the time lasting were 6 and 8 days respectively.Larvae of fifth and sixth instars were not so susceptible,especially when the temperature exceeded 33℃.Cross infections of the NPV with tobacco budworm,Heliothis assulta,was susccessful.In 1975,from July to September,field tests with the NPV to control bollworms were made in cotton fields about 102 mil's at Kung-an County of Hupeh Province.The concentrations used were 1.5×1010 PIBs/mu,3×1010 PIBs/mu and 6×1010 PIBs/mu.The results showed that the NPV was better than the chemical insecticides 1605+DDT.Combined use of the NPV with dilute sevin and Bacillus thurin-giensis suspensions were also tested;and the results were either better or as effective as the NPV or sevin used alone.The application of the NPV VHA-273 to control bollworms in the field seems promising.

自1973—1974年以来,在湖北荆州地区微生物站筛选出一批棉铃虫病毒毒株,其毒力均为80%以上,有的高达100%。其中毒力较强而又比较稳定的VHA-273,经病虫组织切片观察,确定其为核多角体病毒。1974—1975年除对棉铃虫病毒病的组织病理变化作了初步观察外,又继续在室内外对病毒的毒力、剂量与虫龄、温度的关系,及寄主饲料对病毒产量的影响等,进行了一系列的试验,并用VHA-273生产部分病毒,为大田防治试验作了准备。 1975年7—9月,用VHA-273生产的病毒,在湖北公安县雷州公社约102亩的早发棉田进行示范试验,对第2代及第4代棉铃虫的防治效果,先后调查了5次,最后对试验田、对照田及邻田又作了天敌调查,结果均表明试验田的虫口下降率,花、蕾及青铃受害率等,均低于1605+DDT及西维因的对照田,为棉田的生物防治提供了有希望的微生物农药。 VHA-273棉铃虫核多角体病毒,对烟青虫的毒力很强,对两种害虫能交叉感染。因此,它可用于烟青虫的防治。

 
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