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Hydroprene Prolongs Developmental Time and Increases Mortality of Indianmeal Moth (Lepidoptera: Pyralidae) Eggs

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Eggs of the Indianmeal moth, Plodia interpunctella (Hübner), were exposed to the labeled rate of hydroprene (1.9 × 10−3 mg [AI]/cm2) sprayed on concreted petri dishes. These eggs were exposed for 1, 3, 6, 12, and 18 h and until hatching (continuous exposure) at temperatures of 16, 20, 24, 28, and 32°C and 57% RH until the emergence of first instars. The developmental time and egg mortality were significantly influenced by temperature and exposure periods. At 16°C, hydroprene did not cause differences in developmental time when eggs were exposed for different periods. At temperatures >16°C, both exposure period and temperature influenced developmental time. The maximum developmental time (15.0 ± 0.2 d) occurred at 16°C, and the minimum developmental time (3.2 ± 0.3 d) occurred at 32°C. Mortality increased when eggs were exposed to hydroprene for longer periods at all of the five tested temperatures. The greatest mortality (81.6 ± 2.1%) occurred when eggs were continuously exposed on treated surfaces at 32°C. We used developmental time instead of rate (1/developmental time) to fit simple linear or polynomial regression models to the development data. Appropriate models for developmental time and mortality were chosen based upon lack-of-fit tests. The regression models can be used in predictive simulation models for the population dynamics of Indianmeal moth to aid in optimizing use of hydroprene for insect management.

Keywords: Plodia interpunctella; insect growth regulator; population dynamics; surface treatment

Document Type: Research Article

DOI: http://dx.doi.org/10.1603/0022-0493-99.3.1007

Publication date: June 1, 2006

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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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