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antifeedant
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  拒食
    the results of the non-selective antifeedant effect showed that 95% ethanol extract had good effect for the larva,the antifeedant effect was 90.29% and 84.15% after 12h and 24h.
    非选择性拒食作用结果表明,95%的酒精提取物具有良好的拒食效果,12h和24h的拒食率分别达到了90.29%和84.15%。
短句来源
    The contact toxicity LD50 value and antifeedant activity EC50 value were 0.4570 mg/kg and 2.5692 mg/L.
    其触杀毒力的LD50值为0.4570mg/kg,拒食作用的EC50值为2.5692mg/L,表明1.5%斑蝥素AS对粘虫具有很高的杀虫效果。
短句来源
    Antifeedant rates of 2′,3′,22,23-tetrahydroazadirachtin A,22,23-dihydroazadirachtin A and zadirachtin A at the concentration of 3 μg/mL against 3rd instar larvae of Plutella xylostella were 63.74%,80.77% and 85.33%.
    处理后24 h,3μg/mL 2′,3′,22,23-四氢印楝素A、22,23-二氢印楝素A和印楝素A对小菜蛾3龄幼虫的拒食率分别为63.74%、80.77%和85.33%;
短句来源
    At the concentration of 5 μg/mL,Antifeedant rates of them against 3rd instar larvae of Heliothis armigera were 82.75%,90.74% and 94.90%.
    5μg/mL 2′,3′,22,23-四氢印楝素A、22,23-二氢印楝素A和印楝素A对棉铃虫3龄幼虫的拒食率分别为82.75%、90.74%和94.90%。
短句来源
    A New Bioassay Method for Examining Antifeedant Activity
    追踪检测拒食活性物质新的生测方法
短句来源
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  拒食剂
    Activity of Insect Antifeedant Influenced by Leaf Disc Thickness of Cabbage
    甘蓝叶碟厚度对昆虫拒食剂拒食活性的影响
短句来源
    A bait for rodents was developed with the antifeedant for human. The bait was effective, safe and easy to use. The rate of feeding bait was above 90%.
    用人拒食的拒食剂与诱鼠剂等配成了高效安全型灭鼠诱饵,保证了对人的安全性,提高了对鼠的适口性,由此配成的高效安全型灭鼠毒饵,现场盗食丰达90%以上,灭鼠率达85%以上,实验室死亡率达100%,使用十分方便。
短句来源
    An antifeedant can be defined as a chemical that inhibits feeding but does not kill the insect directly;
    拒食剂可以定义为能抑制昆虫取食而不直接杀死它们的化合物。
短句来源
  “antifeedant”译为未确定词的双语例句
    The corrected mortality was 100% after day 7 treatment by disc leaf dipped method when SCEE at 5 mg mL -1 concentration, and the value of AFC 50 (content causing 50% antifeedant rate) of non-choice of SCEE was 0.381 3 mg mL -1 ;
    采用叶蝶法测定 ,当SCEE浓度分别为 5mg·mL-1时 ,处理 7天后其校正死亡率为 10 0 % ; 采用叶碟法测定 ,SCEE对其AFC50 为 0 .3813mg·mL-1。
短句来源
    The fruit extracts of Catunaregam spinosa were used to tested for antifeedant activity against the larvae of Plutella xylostella in the study. The powdered fruit was extracted with petroleum ether,ethyl acetate and methanol,and the extract rates were 0.44%,1.80% and 17.10%,respectively.
    以室温冷浸法,用石油醚、乙酸乙酯和甲醇等溶剂对山石榴Catunaregam spinosa果实进行提取,其提取率分别为0.44%、1.80%和17.10%.
短句来源
    This paper deals with antixenosis,antifeedant of Pogostemon cablin(Blanco)Benth.
    试验采用不同浓度广藿香(Pogostemon cablin(Blanco)Benth.)
短句来源
    , and Paris polyphylla Smith were reported. Methanol extracts of five species showed toxicity against adult house flies with mortalities above 70% 48h after treatment(S.tangutica 93.10%,Ginkgo biloba L.(fruit)85.71%, P.polyphylla 82.76%, C.palmata 79.31% and T.flousiana (stem) 71.03%, respectively). The antifeedant rates of E.
    5种特有植物甲醇提取物对家蝇48h的致死率均在70%以上,华蟹甲草93.10%、银杏(果)85.71%、七叶一枝花82.76%、黄花鸡爪草79.31%和秃杉(茎)71.03%。
短句来源
    The effect of antifeedant and growth inhibition of crude extracts of Ginkgo biloba L. against the diamonback moth, Plutella xylostella L.
    银杏叶粗提物对小菜蛾的拒避和生长发育抑制作用
短句来源
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  antifeedant
Alkaloids from Sophora alopecuroids were bioassayed with Clostera anastomosis for their antifeedant and growth inhibitory effects.
      
The antifeedant rate in choice test reached 62%-86% at the dose 2.5 mg/mL, while in non-choice bioassay the rate was only 20%-29%.
      
In choice bioassay, the antifeedant rate increased with larval instars of C.
      
Extracts from 78 plant species (24 families) were screened for antifeedant activity against the corn wireworm, Melanotus communis Gyll.
      
Antifeedant and insecticidal properties of azadirachtin to the European Corn Borer, Ostrinia nubilalis
      
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With an aim to search for insecticides of good environmental quali-ty,experiments have been carried out on the application of the oil andextracts of the seeds of three species of Meliaceae for the oontrol ofcitrus insects in South China.Results of laboratory and field tests showedthat a spray of 1.4% emulsified neem (Azadirachta indica) seed oilshowed potential as a strong antifeedant for the control of the Asiaticcitrus psyllid (Diaphorina citri) which transmits the yellow-shoot di-sease.There is also...

With an aim to search for insecticides of good environmental quali-ty,experiments have been carried out on the application of the oil andextracts of the seeds of three species of Meliaceae for the oontrol ofcitrus insects in South China.Results of laboratory and field tests showedthat a spray of 1.4% emulsified neem (Azadirachta indica) seed oilshowed potential as a strong antifeedant for the control of the Asiaticcitrus psyllid (Diaphorina citri) which transmits the yellow-shoot di-sease.There is also some evidence to show that the oil exhibited contactaction and insect growth disruption effects on the nymphs of the psyl-lid.The neem seed oil and the petroleum ether extracts of the seed ker-nals of two species of chinaberry (Melia azedarach and M.toosendan)were effective against the citrus red-mite (Panonychus citri).A sprayof 1.4% neem seed oil also gave good control of the larvae of the cit-rus leaf miner (Phyllocnistis citrella). The unique properties of the seeds of some species of Meliaceae asa repellent and antifeedant,safe to the environment and to the naturalenemies of insect pest and compatability with the agroecosystem em-phasize its potential in the integrated control of citrus insect pests.

本文应用楝科植物(印楝、川楝、苦楝)种籽油及其抽提物对柑桔木虱及其他害虫进行一系列的忌避拒食及触杀作用试验,证明印楝油有明显的忌避及拒食作用。印楝油对柑桔潜叶蛾有良好的防效。印楝、川楝及苦楝油对柑桔红蜘蛛也有较强的触杀作用。应用楝科植物杀虫剂可兼治几种害虫,对人畜安全,不污染环境,不会引起抗药性的产生,而且对害虫天敌也比较安全。

Experiments with neem (Azadirachta indica) seed oil and petroleum ether extracts of the seed kernels of Melia toosendan and M. azedarach in laboratory and green house showed their potentials as strong antifeedants in the control of nymphs of the brown planthopper (Nilaparvata lugens). The median antifeedant concentration (AFC50) for the second and tthird instar nymphs was determined to be 0.518% for neem oil, 0.519% for M. toosendan extract and 1.15% for M: azedarach extract. These plant materials also...

Experiments with neem (Azadirachta indica) seed oil and petroleum ether extracts of the seed kernels of Melia toosendan and M. azedarach in laboratory and green house showed their potentials as strong antifeedants in the control of nymphs of the brown planthopper (Nilaparvata lugens). The median antifeedant concentration (AFC50) for the second and tthird instar nymphs was determined to be 0.518% for neem oil, 0.519% for M. toosendan extract and 1.15% for M: azedarach extract. These plant materials also exhibited moderate to slight systemic properties in rice plants and contact insectlcidal action to the planthopper. The unique properties of the toxic principles from the seeds of Meliaceae as brown planthopper-repellents. and antifeedants, their low costs, local availability, safety to the environment and compatibility with the agroecosystem emphasize their potentials in the management of insects of rice.

某些楝科种核油对褐稻虱具有特殊的作用,它与常规的化学杀虫剂不同,并不直接杀死害虫,而是引起褐稻虱对使用种核油的水稻产生拒食或避忌,对褐稻虱重要天敌蜘蛛类并不伤害。

A series of laboratory and field experiments were carried out in Guangzhou using toosendanin for the control of the imported cabbage- worm.Toosendanin was isolated from the bark of the chinaberry tree, Melia toosendan Sieb.et Zucc.in Sichuan Province.The sample for tes- ting contained 58% of pure toosendanin.Results showed toosendanin is a strong antifeedant as wellw as a stomach poison.A concentration of 100 ppm caused 80% mortality to the first instar larvae,and 400 ppm cau- sed 80.9% mortality to the...

A series of laboratory and field experiments were carried out in Guangzhou using toosendanin for the control of the imported cabbage- worm.Toosendanin was isolated from the bark of the chinaberry tree, Melia toosendan Sieb.et Zucc.in Sichuan Province.The sample for tes- ting contained 58% of pure toosendanin.Results showed toosendanin is a strong antifeedant as wellw as a stomach poison.A concentration of 100 ppm caused 80% mortality to the first instar larvae,and 400 ppm cau- sed 80.9% mortality to the third instar larvae in 4 days after applic- ation.Against the fifth instar larvae in the range of 300~2000ppm,with increasing concentrations,the amount of feeding markedly decreased and the mortality increased.(Fig.3). In pot experiment,sprays of toosendanin in the range of 800-2000 ppm gave 78.8~94.1% of foliage protection to the cabbage and a morta- lity of more than 80% in 2 days after spraying.Results of preliminary field experiments showed that spraying with 500-800 ppm of t oosendanin proved effective in controlling the fifth instar larvae,which is in the most voracious feeding stage,Besides,it is comparatively safe to paras- ites of the cabbageworm,such as the braconid Diaeretiella rapae( McIn- tosh). Results of laboratory experiments indicated that the potency and in- secticidal properties of the active ingredient of the neem oil as represe- nted by the tetranortriterpenoid azadirachtin is different from that of the triterpenoid toosendanin from tte chinaberry.Neem oil markedly inhib- ited the larval development and caused malformation of the pupae,sho- wing strong growth inhibiting properties,whereas toosendanin proved to be a strong antifeedant,most of the cabbageworms died after feeding the treated leaves,only a small proportion survived but the pupae were ab- normal(Fig.4).Toosendanin possessing the unique properties of the to- xic ingredients from Melia toosendan as a repellent,antifeedant and stom- ach poison,its local availability as a crude product,safe to the enviro- nment and compatibility with the agroecosystem make highly usable in the vegetable insect pest management program.

川楝素是从川楝树分离得到的一种四环三萜类化合物。它对菜青虫有较强的拒食及毒杀作用,因此施药后能很快地得到保护叶片的效果,且在田间也有较长的残效期。经试验,川楝素对天敌凤蝶金小蜂及蚜茧蜂安全。

 
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