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Detoxification enzyme differences between a herbivorous and predatory mite.

C A Mullin, B A Croft, K Strickler

    Science (New York, N.Y.)
    |September 24, 1982
    PubMed
    Summary
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    Detoxification enzyme activity differs between predatory mites (Amblyseius fallacis) and their prey (Tetranychus urticae). These differences in detoxification pathways contribute to organophosphate resistance and insecticide selectivity, benefiting integrated pest control.

    Area of Science:

    • Acarology
    • Toxicology
    • Biochemistry

    Background:

    • Predatory mites and herbivorous mites exhibit distinct ecological roles.
    • Understanding detoxification mechanisms is crucial for pesticide selectivity and integrated pest management (IPM).

    Purpose of the Study:

    • To compare the detoxification enzyme activities between the predatory mite Amblyseius fallacis and its prey Tetranychus urticae.
    • To investigate the role of these enzymes in conferring organophosphate resistance and insecticide selectivity.

    Main Methods:

    • Enzyme activity assays were performed on both mite species.
    • Comparative analysis of mixed-function oxidase, epoxide hydrolase (cis and trans), glutathione transferase, and esterase activities.

    Main Results:

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    • Predatory mites showed lower mixed-function oxidase and trans-epoxide hydrolase activity compared to prey mites.
    • Predatory mites exhibited higher cis-epoxide hydrolase and glutathione transferase activity.
    • Esterase activity was similar between the two species.

    Conclusions:

    • Detoxification enzyme profiles differ significantly between A. fallacis and T. urticae.
    • Hydrolytic and conjugating reactions are key to organophosphate resistance in these acarines.
    • Enzyme-based insecticide selectivity favors the predator, enhancing integrated pest control strategies.