Campus Units

Entomology

Document Type

Conference Proceeding

Conference

2004 Beltwide Cotton Conferences

Publication Version

Published Version

Publication Date

2004

Journal or Book Title

Proceedings of the 2004 Beltwide Cotton Conferences

First Page

1606

Last Page

1613

Conference Title

2004 Beltwide Cotton Conferences

Conference Date

January 5-9, 2004

City

San Antonio, Texas

Abstract

Survival, morphological, physiological, and reproductive changes in overwintering boll weevils, Anthonomus grandis grandis Boheman, in the Lower Rio Grande Valley of Texas were studied. The number of boll weevils captured per trap declined significantly from the postharvest period to the beginning of the spring over two overwintering seasons: 2000-2001 and 2001-2002. The proportion of males and females trapped did not differ significantly. Ninety percent of captured weevils died within 47.6 days when fed, while 90% of unfed weevils died after 9.0 days. This trend was not affected by month of capture. Female weevil fat body ratings were significantly greater at the beginning of fall than in the spring, while most male weevils from September through March were rated as lean (82.5-100%). No differences in male reproductive parameters were observed in those captured during the cotton free-period compared with the middle of growing cotton season (June), except for testes size which was larger during the latter period. The percentage of females with oocytes in their ovarioles, and the percentage containing oocytes with yolk, were significantly lower in September than in June. During October-March, we did not observe any females with chorionated eggs, whereas in June 96% females contained them. We found that weevil females can oviposit eggs in the Lower Rio Grande Valley during the overwintering period after feeding 7-20 days on a reproductive diet of cotton squares. Females captured later in the winter fed at longer period before laying eggs.

Comments

This proceeding is from Greenberg, S. M., T. W. Sappington, and R. J. Coleman. 2004. Population dynamics of overwintering boll weevils, Anthonomus grandis grandis (Boheman) in the Lower Rio Grande Valley of Texas. Proc. Beltwide Cotton Conf. 2004: 1606-1613.

Rights

Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.

Language

en

File Format

application/pdf

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