Authors: NI, XINZHI; MCCAFFREY, JOSEPH P.; STOLTZ, ROBERT L.; HARMON, BRADLEY L.

Source: Journal of Economic Entomology, Volume 83, Number 6, December 1990 , pp. 2246-2251(6)

Publisher: Entomological Society of America

Abstract:

The effects of adult diet and temperature on oogenesis of the postdiapause cabbage seedpod weevil, Ceutorhynchus assimilis Paykull, were studied to examine the reproductive development of this important pest of rapeseed, Brassica napus L. Diets consisting of racemes with open flowers, racemes without open flowers, racemes with open flowers without stamens, stamens, sugar water (10% sucrose), and distilled water were evaluated with respect to C. assimilis oogenesis. Oogenesis, rated on a 1-3 scale, and measurements of follicle length, width, and volume, were significantly (P < 0.05) enhanced by diets containing racemes (flower buds, stems, and pods) over a 3-wk period. Diets without racemes did not generally result in complete ovariole development over a 3-wk period. Mortality of weevils on the diets with racemes was lower (P < 0.05) than on the diets without racemes. Rapeseed varieties containing a range of low (5 JLmoljg) to high (44 JLmoljg) levels of total glucosinolates were also evaluated. There were no significant (P > 0.05) differences in oogenesis (stage, follicle length, width, and volume) among weevils fed racemes of each variety over a 2-wk period. Ovariole development differed significantly (P < 0.05) among weevils fed rapeseed racemes and maintained at 10, 15, 20, and 25"C over four different feeding durations (1, 2, 3, and 4 wk, respectively). In general, oogenesis occurred at a faster rate in females maintained at 15 and 20"C than those maintained at 10 and 25"C. Ovariole development at 1000Cwas negligible, indicating that this temperature approached the base temperature for development. Few weevils maintained at 25"C completed their reproductive development. There were no significant (P > 0.05) differences in weevil mortality among the temperature treatments over the 4-wk period of study.

Document Type: Research article

Publication date: 1990-12-01

More about this publication?

• Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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