Fenvalerate
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. Evolution of insecticide resistance in non-target black flies (Diptera: Simuliidae) from Argentina
Black flies, a non-target species of the insecticides used in fruit production, represent a severe medical and veterinary problem. Large increases in the level of resistance to the pyrethroids fenvalerate (more than 355-fold) and deltamethrin (162-fold) and a small increase in resistance to the organophosphate azinphos methyl (2-fold) were observed between 1
Memórias do Instituto Oswaldo Cruz. Publicado em: 2012-06
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2. Seletividade de alguns inseticidas/acaricidas aos adultos de Ceraeochrysa cubana (Hagen, 1861) (Neuroptera: Chrysopidae) em laboratorio.
Adultos do predador Ceraeochrysa cubana (Hagen, 1981) foram pulverizados com fempropatrina, fenvalerate, fenitrotion e oxido de fembutatina, nas dosagens medias e recomendadas para uso no campo. A mortalidade dos adultos foi avaliada 96 horas apos os tratamentos, objetivando-se determinar a seletividade desses compostos para o predador. O efeito sobre a fecu
Pesquisa Agropecuaria Brasileira. Publicado em: 2011
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3. Seletividade de alguns inseticidas e acaricidas a ovos e larvas de Ceraeochrysa cubana (Hagen, 1861) (Neuroptera: chrysopidae) em laboratorio.
Este trabalho teve como objetivo avaliar a seletividade de alguns inseticidas e acaricidas a ovos e larvas de Ceraeochrysa cubana, para fornecer subsidios que permitam recomendar, ou nao, o emprego de tais produtos no campo, com populacoes desta especie. Os tratamentos utilizados (ml/100 l de agua) foram: Fenpropathrin 300 CE (30 e 50), Fenitrothion 500 CE (
Pesquisa Agropecuaria Brasileira. Publicado em: 2011
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4. EVALUATION OF A COMPRESSED AIR MODULATOR FOR GC×GC AND APPLICATION TO DETERMINATION OF PYRETHROID PESTICIDES RESIDUES IN GRAPE / AVALIAÇÃO DE UM MODULADOR A AR COMPRIMIDO PARA GC×GC E SUA APLICAÇÃO PARA DETERMINAÇÃO DE RESÍDUOS DE PESTICIDAS PIRETRÓIDES EM UVA
In this study, a new modulator that is simple, robust and presents low operation costs was developed. This modulator uses compressed air to cool two small portions of the second chromatographic column of a GC×GC system. To evaluate the modulation process, solutions of alkanes C7 to C29, and pesticides (bifenthrin, cyfluthrin, cypermethrin, esfenvalerate, fe
Publicado em: 2008
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5. Parametros reprodutivos masculinos e fertilidade de ratos adultos expostos ao inseticida fenvalerato / Male reproductive parameters and fertility of adult rats exposed to fenvalerate
Fenvalerate is a synthetic pyrethroid insecticide widely used in agriculture to control a variety of insects. Although it is considered to be of low acute toxicity to mammals, studies have showed that pyrethroids can have estrogenic activity and can act as endocrine disruptors, causing important reproductive impairment in males. It is documented in the liter
Publicado em: 2006
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6. Desenvolvimento reprodutivo de ratos machos expostos ao fenvalerato in utero e lactação / Reproductive development of male rats exposed to fenvalerate in utero and lactation
Fenvalerate is a synthetic pyrethroid insecticide used in agriculture, cattle raising and in the control of domestic insects, and its reproductive effects are little-known.Some studies already have proposed that fenvalerate is an endocrine disruptor, acting as an environmentalestrogen. Studies done with rats exposed to some pyrethroids showed reduction of sp
Publicado em: 2005
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7. Controle de Tetranychus urticae Koch com fungos entomopatogênicos. / Control of Tetranychus urticae Koch with entomopathogenic fungi.
Among 45 isolates of hyphomycetes tested against Tetranychus urticae, 8 Beauveria bassiana and 4 Metarhizium anisopliae isolates caused mortality >80 and 90%, respectively, 5 days after inoculation with 5x10 7 conidia/mL. Hirsutella sp. caused 73% mortality at a concentration of 1.7x10 7 conidia/mL. Eighty to 100% of cadavers infected by B. bassiana or M. an
Publicado em: 2002
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8. Levels of exposure and biological monitoring of pyrethroids in spraymen.
To assess the exposure response relation of pyrethroids in spraymen, 50 adult male cotton growers were selected and divided into three groups, one group to spray pyrethroids for one day, two groups to spray for three days. Deltamethrin, fenvalerate, and a deltamethrin methamidophos mixture were sprayed by appropriate subgroups for five hours a day. Exposure
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9. Effects of pyrethroid insecticides on subjects engaged in packaging pyrethroids.
A health survey was conducted on 199 workers engaged in dividing and packaging pyrethroids. The subjects were exposed to fenvalerate at 0.012-0.055 mg/m3 and deltamethrin at 0.005-0.012 mg/m3 in the air with simultaneous skin contact for 0.5-4.5 months. Burning sensations and tightness or numbness on the face appeared in two thirds of the subjects and one th
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10. Synthetic pyrethroid insecticides: a dermatological evaluation.
Synthetic pyrethroids are lipophilic insecticides whose biological activity seems to be directly related to their chemical structure. In this investigation differences in cutaneous sensation were detected by human participants between synthetic pyrethroids with a cyano group in the (S)-configuration of the 3-phenoxybenzyl alcohol of their molecular structure
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11. Microbial transformation of the pyrethroid insecticides: permethrin, deltamethrin, fastac, fenvalerate, and fluvalinate.
Pure cultures of Bacillus cereus, Pseudomonas fluorescens, and Achromobacter sp. were shown to transform five pyrethroid insecticides in the presence of Tween 80. One of the major products, 3-phenoxybenzoic acid, was further transformed to 4-hydroxy-3-phenoxybenzoic acid. Permethrin was the most rapidly transformed of the pyrethroids, with a half-life of les