Modeling Demographic Response to Constant Temperature in Hypera postica (Coleoptera: Curculionidae)

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Alfalfa weevil, Hypera postica (Gyllenhal) (Coleoptera: Curculionidae), is among the most destructive pests of alfalfa, Medicago sativa L., in the world. Survivorship and fecundity schedules of H. postica were investigated to characterize the population growth potential of the weevil at six constant temperatures: 11.5, 14.0, 19.0, 24.0, 29.0, and 31.5°C. Preoviposition period, oviposition period and female longevity significantly decreased with rising temperature within the temperature range tested. At the respective temperatures adult female lived an average of 294.2, 230.2, 163.6, 141.0, 84.10, and 32.9 d, with average lifetime progeny production of 470, 814, 2,209, 3,619, 2,656, and 338 eggs per female. The net reproductive rates (R 0 ) were 86.9, 288.0, 869.7, 1,479.7, 989.8, and 107.8 females per female, respectively. Mean daily fecundity (M x ) was modeled as a function of time by using both Enkegaard and Analytis models. Survivorship data (l x ) of adult females were summarized and compared using the shape and scale parameters of the Weibull frequency distribution model across the temperature range tested. Life table entropy values within the range 14.0–31.5°C (H <0.5) indicates Slobodkin’s type I survivorship curve; however, the value of 0.806 at 11.5°C (H >0.5) corresponds to type III. As temperature increased, the r m exhibited an asymmetrical dome-shaped pattern, with a maximum value of 0.114 females per female per d at 29.0°C. The r m –temperature relation of weevils was modeled and critical temperatures (TMin, TOpt, and TMax) for intrinsic rate of increase of the weevil were computed as 8.83, 30.61, and 32.14°C and 5.72, 29.94, and 32.12°C by using Analytis/Allahyari and Analytis/Briere-2 models, respectively.

Keywords: alfalfa weevil; fecundity; life table entropy; modeling; survivorship

Document Type: Research Article


Publication date: April 1, 2010

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  • 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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