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    Author(s): J.W. Van Sambeek; J.R. Bridges
    Date: 1980
    Source: Sonderdruck, Vol. 89: 479-488
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (3.24 MB)


    To determine the effects of juvenoids on the development and sensitivity of the southern pine beetle (SPB) Dendroctonus frontalis Zimm, we treated last-instar larvae, pupae, and callow adults with methoprene, a potent juvenile hormone analogue. From this study we identified a number of juvenoid effects on SPB. Methoprene has the greatest effect on last-instar larvae and on pupae when it has been applied within 24 hours after pupation. Methoprene either stopped developmental progress of C-shaped larvae or produced pupal-adult intermediates from post-feeding and prepupal larvae that pupated normall. The mean effective dose for 50% adult juvenilization of day-old pupae was 0.16 ng. Methoprene treatment of older pupae and callow adults significantly reduced the percentage of fully pigmented adults produced. The pupal bioassay should be useful in determining the presence and effects of pine-produced juvenoids on SPB.

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    Van Sambeek, J.W.; Bridges, J.R. 1980. Influence of the juvenile hormone analogue, methoprene, on development of the southern pine beetle, Dendroctonus frontalis Zimm. (Col. Scolytidae). Sonderdruck, Vol. 89: 479-488

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