Simple method for assessing acephate and methamidophos residues in plant tissues

Richmond, Charles E.; Crisp, Carl E.; Larson, John E.; Pieper, G. R.

doi:10.1007/bf02026979

Cited by 8 publications

(2 citation statements)

References 2 publications

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“…A 10-g subsample was collected for each of vegetative buds (current year's foliage), cone buds (conelets, cones), and pollen buds from the branches removed to collect developing cones. The samples were analyzed for acephate and dimethoate using the method developed for acephate by Richmond et al (1979), and for oxydemeton-methyl using the method developed by Thornton et al (1977). The minimum level of detectability for acephate and dimethoate was 0.05 ppm and for oxydemeton-methyl 1.0 ppm.…”

Section: Methodsmentioning

confidence: 99%

Implantation and Injection of Systemics to Suppress Seed and Cone Insects in Douglas Fir in Montana,

et al. 1985

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The systemic insecticides oxydemeton-methyl and acephate were injected at 10- and 15-cm spacings, and acephate and dimethoate were implanted at 10-cm spacing in Douglas fir, Pseudotsuga menziesii var. glauca (Beissn.) Franco, to improve seed yield. Nutrients were also injected at 15-cm spacing. All treatments except nutrients and dimethoate increased the yield of filled seeds when compared with the checks. The western spruce budworm, Choristoneura occidentalis Freeman, and spruce coneworm, Dioryctria reniculelloides Mutuura and Munroe, caused most of the damage to cones.

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Section: Methodsmentioning

confidence: 99%

Implantation and Injection of Systemics to Suppress Seed and Cone Insects in Douglas Fir in Montana,

et al. 1985

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“…Acephate is a systemic phosphoramidothioate insecticide that is marketed under the trade name 'Orthene'.1.2 It is of moderate persistence and is effective against citrus thrips and citrus blackfly.3-h Acephate residues can be determined by gas-liquid chromatography (g.1.c.).'. [4][5][6][7][8][9] The residue dynamics of acephate and its hydrolysis product methamidophos, on and in citrus foliage, have been reported .4, Dimethoate is an insecticide and acaricide that has both contact and systemic activity.*,'"." It is of short persistence'0-'6 and is effective against aphids and citrus thrips.2.'U.…”

Section: Introductionmentioning

confidence: 99%

Analysis and dissipation of dislodgable residues of acephate, dimethoate and formetanate hydrochloride on citrus foliage

1985

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Dislodgable residues of acephate and its hydrolysis product methamidophos, dimethoate and its oxygen analogue omethoate (dimethoxon), and formetanate hydrochloride on citrus foliage were determined by gas–liquid chromatography. The use of 5% OV‐101 coated on a Carbowax 20M surface‐modified support (Ultra‐Bond 20M) allowed the reproducible analysis of dimethoate and omethoate residues. Formetanate hydrochloride residues were analysed as the free base, without preparation of a derivative, on a column packed with 5% Apiezon N coated on 80–100 mesh Ultra‐Bond 20M. The dissipation of the residues of the three pesticides applied to citrus trees was studied. Acephate and formetanate hydrochloride dissipation curves followed first‐order kinetics; dimethoate residues were best characterised by two first‐order kinetic processes. The half‐life values were 8.2 days for acephate, undeterminably long for formetanate hydrochloride, and 2.2 days (the 1–10 days portion) and 7.0 days (the 10–49 days portion) for dimethoate.

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Degradation and persistence of gamma‐HCH and chlorpyrifos‐methyl in Ponderosa pine bark

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1983

Pestic. Sci.

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Residues of gamma‐HCH and chlorpyrifos‐methyl in Ponderosa pine bark (Pinus ponderosa Laws.) were determined 7‐300 days after spray treatment, by a rapid extraction method using ethyl acetate and sodium sulphate, and analysis by gasliquid chromatography using either an electron‐capture or nitrogen‐phosphorus detector. The residue data were fitted into a power curve equation, Y = axb, to determine the rates of insecticide disappearance. The half‐life values (μg cm−2), as interpolated from the power curve, indicate that 50% disappearance occurred in 43 (± 9) days for gamma‐HCH and 102 (± 26) days for chlorpyrifos‐methyl. When half‐life values, however, are computed from extrapolated initial deposits, 50% disappearance occurred in 6 (± 1) days for gamma‐HCH and 15 (±4) days for chlorpyrifos‐methyl.

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Simple method for assessing acephate and methamidophos residues in plant tissues

Cited by 8 publications

References 2 publications

Implantation and Injection of Systemics to Suppress Seed and Cone Insects in Douglas Fir in Montana,

Implantation and Injection of Systemics to Suppress Seed and Cone Insects in Douglas Fir in Montana,

Analysis and dissipation of dislodgable residues of acephate, dimethoate and formetanate hydrochloride on citrus foliage

Degradation and persistence of gamma‐HCH and chlorpyrifos‐methyl in Ponderosa pine bark

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