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1 June 2006 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.

S. Mohandass, F. H. Arthur, K. Y. Zhu, and J. E. Throne "Hydroprene Prolongs Developmental Time and Increases Mortality of Indianmeal Moth (Lepidoptera: Pyralidae) Eggs," Journal of Economic Entomology 99(3), 1007-1016, (1 June 2006).
Received: 28 June 2004; Accepted: 1 July 2005; Published: 1 June 2006

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