Skip to Main Content
U.S. Forest Service
Caring for the land and serving people

United States Department of Agriculture

Home > Search > Publication Information

  1. Share via EmailShare on FacebookShare on LinkedInShare on Twitter
    Dislike this pubLike this pub
    Author(s): Terence L. Wagner; Eric J. Villavaso
    Date: 1999
    Source: Ann. Entomol. Soc. Am. 92(3): 382-395 (1999)
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (390 KB)


    This study examines the diapause response among boll weevils collected as immatures in squares at different times of the summer and held under simulated field photoperiods and temperatures of northern Mississippi. The percentage of adults exhibiting prediapause increased seasonally, starting with the 1st generation in July and achieving a maximal rate of 96.7% late in the year. A greater proportion of males achieved diapause than females at any given time, except late in the season when convergence in the diapause response of both sexes occurred. These results suggest that individuals in a population have different thresholds of sensitivity to the environmental cues regulating the onset of diapause. Models described the percentage of males and females in prediapause as a function of Julian date of emergence and daylength on the day of emergence. The latter models have potential application over a wide region of the Cotton Belt. Information from this study was used to suggest August starting dates for diapause control applications in the mid-South-recommendations that subsequently were implemented in eradication programs in Alabama and Mississippi.

    Publication Notes

    • You may send email to to request a hard copy of this publication.
    • (Please specify exactly which publication you are requesting and your mailing address.)
    • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.


    Wagner, Terence L.; Villavaso, Eric J. 1999. Diapause in the Boll Weevil (Coleoptera: Curculionidae): Seasonal Occurrence in Mississippi Populations. Ann. Entomol. Soc. Am. 92(3): 382-395 (1999)


    Anthonomus grandis grandis, diapause, cotton, model

    Related Search

    XML: View XML
Show More
Show Fewer
Jump to Top of Page