Detoxification enzymes and the effects of temperature on the toxicity of pyrethroids to the fall armyworm, Spodoptera frugiperda (Lepidoptera:Noctuidae)
{"title":"Detoxification enzymes and the effects of temperature on the toxicity of pyrethroids to the fall armyworm, Spodoptera frugiperda (Lepidoptera:Noctuidae)","authors":"Fred Punzo","doi":"10.1016/0742-8413(93)90187-P","DOIUrl":null,"url":null,"abstract":"<div><p>1. The effects of temperature on the topical toxicity of cypermethrin and fenvalerate to fifth-instar larvae of the fall annyworm, <em>Spodoptera frugiperda</em>, were investigated, as well as their effects on ataxia and prostration. Activities of carboxylesterase and glutathione <em>S</em>-transferase were also assessed.</p><p>2. Pyrethroid toxicities were characterized by a negative temperature coefficient (TC) between 15 and 27°C, and a positive TC between 27 and 38°C. Fenvalerate was more toxic at all test temperatures.</p><p>3. The median time for the onset of ataxia and prostration decreased as temperature increased.</p><p>4. Activity (μmol/min/mg protein) of carboxylesterase and glutathione <em>S</em>-transferase was significantly lower for fenvalerate-treated insects (217.4 and 17.2, respectively) than for cypermethrin (344.7, 39.7).</p></div>","PeriodicalId":72650,"journal":{"name":"Comparative biochemistry and physiology. C: Comparative pharmacology","volume":"105 2","pages":"Pages 155-158"},"PeriodicalIF":0.0000,"publicationDate":"1993-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0742-8413(93)90187-P","citationCount":"28","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Comparative biochemistry and physiology. C: Comparative pharmacology","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/074284139390187P","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 28
Abstract
1. The effects of temperature on the topical toxicity of cypermethrin and fenvalerate to fifth-instar larvae of the fall annyworm, Spodoptera frugiperda, were investigated, as well as their effects on ataxia and prostration. Activities of carboxylesterase and glutathione S-transferase were also assessed.
2. Pyrethroid toxicities were characterized by a negative temperature coefficient (TC) between 15 and 27°C, and a positive TC between 27 and 38°C. Fenvalerate was more toxic at all test temperatures.
3. The median time for the onset of ataxia and prostration decreased as temperature increased.
4. Activity (μmol/min/mg protein) of carboxylesterase and glutathione S-transferase was significantly lower for fenvalerate-treated insects (217.4 and 17.2, respectively) than for cypermethrin (344.7, 39.7).
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