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Related Experiment Videos

Technique for age-grading late third-instar Hypoderma lineatum (Diptera: Oestridae).

P J Scholl, K A Schwinghammer, W F Chamberlain

    Journal of Medical Entomology
    |May 1, 1989
    PubMed
    Summary

    Age-grading third-instar Hypoderma lineatum larvae is possible by observing posterior spiracle development and cuticle color changes across three distinct phases. This method aids in understanding cattle grub development stages.

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    Area of Science:

    • Veterinary Entomology
    • Parasitology
    • Insect Development

    Background:

    • Hypoderma lineatum (Villers) are cattle grubs causing economic losses in livestock.
    • Accurate age-grading of larvae is crucial for effective pest management strategies.
    • Previous methods for age determination may lack precision.

    Purpose of the Study:

    • To describe three distinct developmental phases for age-grading third-instar Hypoderma lineatum.
    • To establish reliable visual indicators for larval development stages.

    Main Methods:

    • Observation of third-instar Hypoderma lineatum larvae.
    • Analysis of cuticle coloration changes.
    • Assessment of posterior spiracular plate melanization and development.

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    Main Results:

    • Phase 1 (P1): White cuticle, unmelanized spiracular plates, progressing to yellow cuticle with initial spiracular margin melanization.
    • Phase 2 (P2): Darkening cuticle (yellow to tan to light brown) with progressive spiracular plate melanization.
    • Phase 3 (P3): Fully developed and melanized posterior spiracular plates without a space between them; cuticle is not yet black.

    Conclusions:

    • Cuticle color and posterior spiracular plate development provide a reliable method for age-grading third-instar Hypoderma lineatum.
    • These visual cues can aid in determining larval age and developmental stage for improved pest management.
    • The three described phases offer a practical tool for researchers and veterinarians.