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Modelling temperature-dependent development and survival of Otiorhynchus sulcatus (Coleoptera: Curculionidae)

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1 We conducted a laboratory experiment to quantify the stage-specific effects of temperature on development time and survival of Otiorhynchus sulcatus (Fabricius) (Coleoptera: Curculionidae), a serious economic pest of horticultural crops. Quantification of the relationship between stage development and temperature is required to predict seasonal occurrence of particular life stages and to optimize the timing of monitoring and control tactics.

2 Temperature-dependent survival rate was quantified using an extreme value function and showed a skewed bell shape, due to the vulnerability of the insect to high temperature in all stages.

3 The development times of O. sulcatus decreased with increasing temperature up to 27 °C for eggs and 24 °C for larvae and pupae. The nonlinear relationship between development rate and temperature was described using the Logan model, and enabled us to estimate the optimum temperature for development.

4 The inherent variation of development time was estimated from the cumulative frequency of stage emergence, which was modelled using the cumulative Weibull function.

5 The stage emergence model, which simulated the transition from one stage to the next in relation to temperature and cohort age, was constructed by incorporating stage-specific survival and development rate submodels with the Weibull model of stage frequency.

6 Our results show a difference in optimal temperature regime among developmental stages of O. sulcatus.
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Keywords: Black vine weevil; development rate; development time variation; phenology; survival; temperature

Document Type: Research Article

Affiliations: Department of Entomology, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061-0319, U.S.A.

Publication date: 2005-08-01

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