Dissipation of deltamethrin applied to forage alfalfa

Deltamethrin was applied at 14 g/ha to immature, actively growing alfalfa, and initial residues of 4.2 ppm declined rapidly and biphasically. A two-compartment model was fitted to the residue data to calculate a 50% disappearance time (DT50) of 3.4 days and a 90 day DT of 14 days. When the insectici...

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Bibliographic Details
Published in:Journal of agricultural and food chemistry 1989-07, Vol.37 (4), p.1150-1153
Main Authors: Hill, Bernard D., Inaba, Dan J., Charnetski, William A.
Format: Article
Language:English
Subjects:
Agrochemicals products
Animal, plant and microbial ecology
Applied ecology
Biological and medical sciences
Chemical control
Control
Ecotoxicology, biological effects of pollution
Fundamental and applied biological sciences. Psychology
INSECTICIDAS
INSECTICIDE
INSECTICIDES
MEDICAGO SATIVA
Other agrochemicals used in plant protection (herbicides, fungicides, etc.)
Phytopathology. Animal pests. Plant and forest protection
Pollution effects and side effects of agrochemicals on crop plants and forest trees. Other anthropogenic factors
Pollution effects. Side effects of agrochemicals
Protozoa. Invertebrates
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Summary:Deltamethrin was applied at 14 g/ha to immature, actively growing alfalfa, and initial residues of 4.2 ppm declined rapidly and biphasically. A two-compartment model was fitted to the residue data to calculate a 50% disappearance time (DT50) of 3.4 days and a 90 day DT of 14 days. When the insecticide was applied at 14 g/ha to more mature alfalfa in bloom, initial residues of 2.9 ppm declined with a DT50 of 4.1 days and a DT90 of 22 days. Small amounts of the alpha-deltamethrin isomer were detected; trans-deltamethrin isomers were not detected on day 0 but increased rapidly to 0.21 ppm by day four and then slowly declined.
ISSN:0021-8561
1520-5118
DOI:10.1021/jf00088a073