首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   110篇
  免费   12篇
  国内免费   2篇
农学   1篇
基础科学   1篇
  3篇
综合类   24篇
水产渔业   3篇
畜牧兽医   7篇
植物保护   85篇
  2023年   5篇
  2022年   1篇
  2021年   2篇
  2020年   6篇
  2019年   4篇
  2018年   4篇
  2017年   2篇
  2016年   6篇
  2015年   3篇
  2014年   4篇
  2013年   6篇
  2012年   3篇
  2011年   7篇
  2010年   4篇
  2009年   6篇
  2008年   6篇
  2007年   6篇
  2006年   1篇
  2005年   3篇
  2004年   1篇
  2003年   2篇
  2002年   2篇
  2001年   2篇
  2000年   2篇
  1999年   10篇
  1998年   3篇
  1997年   5篇
  1996年   3篇
  1995年   7篇
  1993年   2篇
  1992年   2篇
  1990年   1篇
  1989年   1篇
  1988年   1篇
  1987年   1篇
排序方式: 共有124条查询结果,搜索用时 15 毫秒
91.
A series of pyrethroids, related to NRDC 200 and etofenprox (MTI500) in which the central region is represented by a non-ester link, have been tested against one susceptible and two resistant strains (kdr and super-kdr) of houseflies (Musca domestica L.). A range of structural variations in the central region have been examined. Resistance factors mostly fell within narrow ranges for both resistant strains i.e. 10–50-fold resistance against kdr and 50–150-fold against super-kdr; thus no correlation of resistance with structural features was detectable for this region. Other changes examined were the substituent on the phenyl ring in the ‘acid’ component and the bridging group in the ‘alcohol’ component where small variations in response were observed. Examination of the effect of varying the ‘alcohol’ side chain was limited by lack of active analogues.  相似文献   
92.
Populations of the housefly Musca domestica isolated from farms in different German districts with strong resistance problems were compared to laboratory strains with varying resistance spectra. Resistance against pyrethroids, organophosphates and carbamates was tested using impregnated filter papers, and by topical application using a susceptible housefly strain (origin WHO) for comparison. The multi-resistant fly strains tested had a strong resistance against these insecticide groups, ranging from 37- to >10000-fold for organophosphates and 150- to >6600-fold for pyrethroids. The constituent enantiomer pairs of the α-cyano-pyrethroid cyfluthrin were tested, as was beta-cyfluthrin. With respect to multi-resistant fly strains, the isomers II and IV had the best activity, with LD50 values of 0·012 and 0·014 μg per fly, respectively. In addition, different groups of insect growth regulators (juvenile hormone analogues, chitin synthesis inhibitors and one triazine derivative) were tested in a special larvicidal test. The chitin synthesis inhibitors were quite effective against multi-resistant M. domestica strains except for one strain with strong resistance against chitin synthesis inhibitors, developed after extensive treatments with benzoylphenylureas for several years. The fly strains tested were not resistant against cyromazine. Additionally, the insecticides were combined with the synergists piperonyl butoxide, tributylphosphorotrithioate (DEF) and Cibacron blue and tested against the fly strain with the strongest resistance spectrum (‘Grimm’) in comparison to the susceptible strain (‘WHO-N’). Piperonyl butoxide had the greatest effect on the efficacy of cyfluthrin followed by Cibacron blue and DEF. In a parallel investigation with susceptible and resistant house fly strains, different enzyme activities related with resistance mechanisms were tested, e.g. glutathione S-transferase (3·5-fold) and mixed-function oxidase (2·3-fold). Implications of these results for management of insecticide resistance in M. domestica are discussed.  相似文献   
93.
Isomers of pyrethroids usually have different insecticidal activities. Permethrin, a non‐cyano pyrethroid, is not an exception and cis‐permethrin is much more active than the trans‐isomer against Triatoma infestans, vector of Chagas' Disease in Argentina. The large‐scale separation of cis‐ and trans‐permethrin was performed by successive recrystallizations from ethanol‐water mixtures. An aqueous suspension concentrate (flowable) formulation of pure crystalline cis‐permethrin was prepared and assayed for its insecticidal activity on wood and ceramic surfaces against nymph V of T infestans. This formulation was at least three times more effective than deltamethrin, with LC50 values on ceramic of 0.11 µg cm−2 and 0.33 µg cm−2 respectively. On wood surfaces, the LC50 value was 0.57 µg cm−2 compared with 3.20 µg cm−2 for deltamethrin. Against other insect species such as Periplaneta americana, Aedes aegypti and Culex quinquefasciatus, the suspension concentrate formulation of cis‐permethrin was, however, less effective than similar formulations of deltamethrin or β‐cypermethrin. © 2000 Society of Chemical Industry  相似文献   
94.
A neurophysiological assay developed previously was used to assess the incidence of nerve insensitivity resistance to synthetic pyrethroids in field strains of Helicoverpa armigera. Almost 70% of individuals from a sample of a highly pyrethroid-resistant population from Jiangsu Province, China were nerve-insensitive. Subsequent selection resulted in a strain homogeneous for expression of this mechanism. Likewise, over 95% of a sample from a strain of the insects from Andhra Pradesh, India were nerve-insensitive and a homogeneous strain was developed. Development of a nerve-insensitive laboratory strain of Heliothis virescens was undertaken but homozygosity could not be obtained. It is suggested that high fitness costs may be associated with this mechanism. The incidence of nerve insensitivity in Heliothine pests is reviewed and the role of phenotypic expression assays in molecular studies highlighted. ©1997 SCI  相似文献   
95.
96.
97.
普通大蓟马Megalurothrips usitatus在海南省对豇豆造成严重危害且抗药性逐渐增强。本研究测定了2019年至2021年海南省普通大蓟马对氯菊酯和甲氰菊酯的抗性。结果表明,海口、乐东和三亚3个地理种群对甲氰菊酯处于极高水平抗性,对氯菊酯处于高水平抗性,且抗性逐年增强。对普通大蓟马钠离子通道序列分析发现存在M283R突变,该突变位于钠离子通道同源结构域Ⅰ。突变频率检测显示,2019年至2021年连续3年海口种群该突变位点的突变频率分别为1/30、1/30、3/30,有升高趋势。本研究发现海南省普通大蓟马从2019年到2021年对拟除虫菊酯类药剂的抗药性呈逐年上升趋势。  相似文献   
98.
99.

BACKGROUND

With no effective drugs or widely available vaccines, dengue control in Bangladesh is dependent on targeting the primary vector Aedes aegypti with insecticides and larval source management. Despite these interventions, the dengue burden is increasing in Bangladesh, and the country experienced its worst outbreak in 2019 with 101 354 hospitalized cases. This may be partially facilitated by the presence of intense insecticide resistance in vector populations. Here, we describe the intensity and mechanisms of resistance to insecticides commonly deployed against Ae. aegypti in Dhaka, Bangladesh.

RESULTS

Dhaka Ae. aegypti colonies exhibited high-intensity resistance to pyrethroids. Using CDC bottle assays, we recorded 2–24% mortality (recorded at 24 h) to permethrin and 48–94% mortality to deltamethrin, at 10× the diagnostic dose. Bioassays conducted using insecticide–synergist combinations suggested that metabolic mechanisms were contributing to pyrethroid resistance, specifically multi-function oxidases, esterases, and glutathione S-transferases. In addition, kdr alleles were detected, with a high frequency (78–98%) of homozygotes for the V1016G mutation. A large proportion (≤ 74%) of free-flying and resting mosquitoes from Dhaka colonies survived exposure to standard applications of pyrethroid aerosols in an experimental free-flight room. Although that exposure affected the immediate host-seeking behavior of Ae. aegypti, the effect was transient in surviving mosquitoes.

CONCLUSION

The intense resistance characterized in this study is likely compromising the operational effectiveness of pyrethroids against Ae. aegypti in Dhaka. Switching to alternative chemical classes may offer a medium-term solution, but ultimately a more sustainable and effective approach to controlling dengue vectors is required. © 2023 The Authors. Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.  相似文献   
100.
采用药膜法测定了溴氰菊醋、甲氰菊酯、氰戊菊酯和三氟氯氰菊酯对广赤眼峰(TrichogrammaevanescensWestwood)、螟黄赤眼峰(T.confusumWiggiani)、松毛虫赤眼峰(T.dendrolimiMasts.)成蜂的毒力。结果表明,不同药剂对同一种赤眼峰成蜂的毒力不同;不同赤眼蜂种群的成峰对同一药剂的反应差异也较大,其中溴氰菊酯的毒力最大(LC_(50)<2.30μg·mL ̄(-1)),甲氰菊酯相对较小(LC>12.50μg·mL ̄(-1));3种赤眼峰中,以广赤眼蜂对药剂反应较迟钝,忍受能力较强。  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号