Stability of pyrethroids on wheat in storage

Noble, R. M.; Hamilton, Denis; Osborne, William J.

doi:10.1002/ps.2780130304

Cited by 48 publications

(20 citation statements)

References 9 publications

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“…In contrast, pirimiphos-methyl applied at 10 mg/kg showed rapid decomposition, only 16% of the applied dose remaining after 14 weeks. Deltamethrin applied to wheat at a moisture content of 15% and stored at 358 C has been estimated to have a half-life of 35 weeks (Noble et al, 1982). However, in trials undertaken at lower temperatures, insecticide persistence was shown to improve.…”

Section: Discussionmentioning

confidence: 98%

The protection of maize against Prostephanus truncatus (Horn), using insecticide sprays in Tanzania

Dales¹,

Golob²

1997

International Journal of Pest Management

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Trials were undertaken in Tanzania to examine the residual efficacy of spray applications of insecticide mixtures as protectants of shelled maize grain against infestation by Prostephanus truncatus (Horn) and Sitophilus species. Application of 0× 5 mg/kg deltamethrin, applied with either 8 mg/kg pirimiphos-methyl or 8 mg/kg chlorpyrifosmethyl, provided complete protection for at least nine months against both types of pest, regardless of whether the maize was stored in galvanized steel bins or jute bag stacks.

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Section: Discussionmentioning

confidence: 98%

The protection of maize against Prostephanus truncatus (Horn), using insecticide sprays in Tanzania

Dales¹,

Golob²

1997

International Journal of Pest Management

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“…In corn treated with three different rates (0.5, 0.75, or 1 ppm) of deltamethrin, survival of T. castaneum adults was observed at all the storage periods; however, there were no progeny. The signiÞcant decline observed in our study in the efÞcacy of chlorpyrifos-methyl ϩ deltamethrin as the posttreatment period increased may be because of degradation of chlorpyrifos-methyl, which breaks down rapidly at high grain temperatures and moisture contents; residues of deltamethrin are more persistent on grains (Noble et al 1982, Arthur et al 1992, Afridi et al 2001. Subramanyam et al (2012) reported 100% T. castaneum mortality and signiÞcant reduction of progeny production on wheat treated by using 3 ppm of chlorpyrifos-methyl and 0.5 ppm of deltamethrin.…”

Section: Discussionmentioning

confidence: 69%

Efficacies of Spinosad and a Combination of Chlorpyrifos-Methyl and Deltamethrin Against Phosphine-Resistant <I>Rhyzopertha dominica</I> (Coleoptera: Bostrichidae) and <I>Tribolium castaneum</I> (Coleoptera: Tenebrionidae) on Wheat

et al. 2013

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Highly phosphine-resistant populations of Rhyzopertha dominica (F.) (Coleoptera: Bostrichidae) and Tribolium castaneum (Herbst) (Coleoptera: Tenebrionidae) have recently been found in Oklahoma grain storage facilities. These findings necessitate development of a phosphine resistance management strategy to ensure continued effective use of phosphine. Therefore, we investigated the efficacies of two grain insecticides, namely, spinosad applied at label rate of 1 ppm and a mixture of chlorpyrifos-methyl and deltamethrin applied at label rates of 3 and 0.5 ppm, respectively, against highly phosphine-resistant R. dominica and T. castaneum. Adult mortality and progeny production suppression of spinosad- or chlorpyrifos-methyl + deltamethrin mixture-treated wheat that had been stored for 2, 84, 168, 252, and 336 d posttreatment were assessed. We found that both spinosad and chlorpyrifos-methyl + deltamethrin were effective against phosphine-resistant R. dominica and caused 83-100% mortality and also caused total progeny production suppression for all storage periods. Spinosad was not effective against phosphine-resistant T. castaneum; the highest mortality observed was only 3% for all the storage periods. Chlorpyrifos-methyl + deltamethrin was effective against phosphine-resistant T. castaneum only in treated wheat stored for 2 and 84 d, where it caused 93-99% mortality. However, chlorpyrifos-methyl + deltamethrin was effective and achieved total suppression of progeny production in T. castaneum for all the storage periods. Spinosad was not as effective as chlorpyrifos-methyl + deltamethrin mixture at suppressing progeny production of phosphine-resistant T. castaneum. These two insecticides can be used in a phosphine resistance management strategy for R. dominica and T. castaneum in the United States.

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“…The method described is rapid and more economical than the method of Simonaitis and Cail (1977) for permethrin, and than that used by Noble et al, (1982) and Hargreaves et al, (1982) for deltamethrin, fenvalerate, permethrin, and phenothrin. Less than 40mL of solvents is required to extract and clean up a 5-g sample.…”

Section: Resultsmentioning

confidence: 95%

Gas Chromatographic Determination of Cypermethrin and Fenvalerate Residues in Wheat and Milled Fractions

Joia

Sarna

Webster

1985

International Journal of Environmental Analytical Chemistry

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A method to determine cypermethrin and fenvalerate residues in wheat and milled fractions was developed. The method involved extraction of residues with acetonehexane and partitioning residues into hexane using aqueous sodium chloride solution. After concentrating hexane extracts, column chromatography cleanup was performed on Pasteur pipette micro columns containing Florid, using benzene as the elution solvent, and packed column electron-capture GC was used for analysis. The limits of detection with this method were 0.02 mg kgfor fenvalerate. Average recoveries of 82 to 98% of cypermethrin and 80-86% of fenvalerate were obtained from wheat and milled fractions fortified at 0.41 to 3.80 mg kg-'. No interference was observed from co-extractives. for cypermethrin and 0.04 mg kg-KEY WORDS: GC analysis, fenvalerate, cypermethrin, stored wheat, milled fractions. insecticide residues.?Present address:

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Stability of pyrethroids on wheat in storage

Cited by 48 publications

References 9 publications

The protection of maize against Prostephanus truncatus (Horn), using insecticide sprays in Tanzania

The protection of maize against Prostephanus truncatus (Horn), using insecticide sprays in Tanzania

Efficacies of Spinosad and a Combination of Chlorpyrifos-Methyl and Deltamethrin Against Phosphine-Resistant <I>Rhyzopertha dominica</I> (Coleoptera: Bostrichidae) and <I>Tribolium castaneum</I> (Coleoptera: Tenebrionidae) on Wheat

Gas Chromatographic Determination of Cypermethrin and Fenvalerate Residues in Wheat and Milled Fractions

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