Dissipation rates of insecticides in six minor vegetable crops grown on organic soils in Ontario, Canada

Braun, H. E.; Ritcey, G.; Frank, R.; McEwen, F. L.; Ripley, B. D.

doi:10.1002/ps.2780110608

Cited by 20 publications

(11 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The dissipation of cypermethrin, deltamethrin and fenvalerate was examined on these crops over several growing seasons. This research extends the residue studies on Ontario vegetables begun by Braun et al 9, 10 and McEwen et al 11…”

Section: Introductionsupporting

confidence: 77%

Pyrethroid insecticide residues on vegetable crops

Ripley

Ritcey

Harris

et al. 2001

Pest Management Science

View full text Add to dashboard Cite

Pyrethroid insecticides were applied on various vegetable crops as foliar treatments to determine dissipation rates. On Chinese broccoli (Guy Lon), Chinese mustard (Pak Choi) and Chinese cabbage (Kasumi, napa), fenvalerate was persistent with residues of 0.10, 0.14 and 0.11 mg kg-1, respectively, by day 21. Cypermethrin residues on head lettuce were below 0.1 mg kg-1 by day 10 but on the leafier romaine and endive varieties it was more persistent and required 14-19 days to dissipate below this concentration. After three applications, residues of cypermethrin in harvested carrots and of permethrin in eggplant were not detected on the day of application. On asparagus, deltamethrin and cypermethrin residues declined to less than 0.1 mg kg-1 by days 1 and 2, respectively; permethrin was more persistent, requiring more than 2 days to decline to less than 0.1 mg kg-1. Deltamethrin on dry (cooking) and Spanish onions was not detected on the day of application. On tomatoes, the concentration of permethrin was 0.093 mg kg-1 on the day of application and declined to about 0.05 mg kg-1 after 2-4 days. In general, permethrin, cypermethrin and deltamethrin residues declined to acceptable concentrations within an acceptable pre-harvest interval. Fenvalerate may be too persistent on these speciality crops unless a maximum residue limit > 0.1 mg kg-1 is permitted.

show abstract

Section: Introductionsupporting

confidence: 77%

Pyrethroid insecticide residues on vegetable crops

Ripley

Ritcey

Harris

et al. 2001

Pest Management Science

View full text Add to dashboard Cite

show abstract

“…Braun et al (1980) also reported a similar behavior for Pirimicarb, which was rapidly transformed into metabolites I1 and I11 immediately after treatment. Therefore, it could be supposed that, in the former case, the AI had already penetrated the leaves and that it had been quickly transformed biologically, while in the latter case the AI was still on the leaves and not yet degraded.…”

Section: Resultssupporting

confidence: 56%

Pirimicarb and its metabolite residues in lettuce. Influence of cultural environment

Cabras¹,

Spanedda²,

Cabitza³

et al. 1990

J. Agric. Food Chem.

View full text Add to dashboard Cite

The fate of Primicarb (I) residue on field and greenhouse lettuce was studied. The parent compound was quickly transformed into its N-methyl-N-formyl (11) and N-demethyl (111) analogues. Five days after treatment, another metabolite, N-demethylphenol (VI), was determined, though in low amounts. These metabolites were rapidly degraded, and 10 days after application of Pirimicarb, only I11 was detected, showing a very low residue. The very rapid decay rate of Pirimicarb into its metabolites should indicate that volatilization does not represent the primary means of loss of I in plants and that the aphicide action could also be ascribed to its metabolic products. Though the microclimatic conditions were different in the two experiments, the degradative kinetics were similar in both cases, because in the field relative humidity and wind speed, compensating for each other, determined a tendency to evaporation analogous to that occurring in the greenhouse.Aphids are among the most important pests in the cultivation of lettuce. Of the numerous insecticides on sale, Pirimicarb, 2-(dimethylamino)-5,6-dimethylpyrimidin-4yl dimethylcarbamate (I) (Figure l ) , is one of the few to possess selective action against aphids but not against their natural predators.Pirimicarb is rapidly lost in plants after spraying, mainly by volatilization but also by photochemical and metabolic degradation. The major degradative products are the carbamate-containing metabolites I1 (2-[(methylformyl)amin0]-5,6-dimethylpyrimidin-4-y1 dimethylcarbamate) and I11 (2-methylamino-5,6-dimethylpyrimidin-

show abstract

“…Studies in Canada revealed organophosphorous residue decreased rapidly within the first 48 hours. [25][26] Kabir et al [27] also reported an abrupt decrease of diazinon residues in brinjal within the first few days.…”

Section: Dissipation Kinetics Of Diazinon On Grapesmentioning

confidence: 94%

Diazinon residues and degradation kinetics for grapes under field conditions

Torabi

Talebi

2013

Journal of Environmental Science and Health, Part B

View full text Add to dashboard Cite

The dissipation of diazinon (O,O-diethyl O-2-isopropyl-6-methylpyrimidin-4-yl phosphorothioate) in grapes was investigated to determine its pre-harvest interval (PHI). Diazinon was applied to grapes at the recommended dosage (0.9 g a.i. L(-1)) and twice the recommended dosage (1.8 g a.i. L(-1)) three times, at the fruit formation stage, the sour stage, and the ripening stage, in a field trial with three replications. Samples were taken at 0, 1, 2, 4, 7, 11, 15, 20, 26 and 32 days after spraying. The residue was extracted using a water/methanol/acetonitrile (1:1:1, v/v/v) solvent and solid phase extraction was employed for cleanup. Quantitative analysis was performed using a gas chromatograph equipped with a nitrogen-phosphorus detector. The dissipation trend for the recommended dosage and twice the recommend dosage followed the simple first-order kinetic model (SFOK) (DT(50) = 3.29 days, DT(90) = 11 days, PHI = 13.5 days) and first-order double-exponential decay (FODED) model (DT(50) = 1.08 days, DT(90) = 5.82 days, PHI = 15.29 days), respectively. The average initial deposit of diazinon at the recommended dosage was 9.04 mg kg(-1)and for twice the recommended dosage was 27.38 mg kg(-1)and it dissipated rapidly within days of spraying.

show abstract

Dissipation rates of insecticides in six minor vegetable crops grown on organic soils in Ontario, Canada

Cited by 20 publications

References 7 publications

Pyrethroid insecticide residues on vegetable crops

Pyrethroid insecticide residues on vegetable crops

Pirimicarb and its metabolite residues in lettuce. Influence of cultural environment

Diazinon residues and degradation kinetics for grapes under field conditions

Contact Info

Product

Resources

About