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Modelling reproduction of Plutella xylostella L. (Lepidoptera: Plutellidae): climate change may modify pest incidence levels

Published online by Cambridge University Press:  14 March 2012

C.A. Marchioro
Affiliation:
Department of Zoology, Universidade Federal do ParanáPO Box 19.020, 81531-990 Curitiba, PR, Brazil
L.A. Foerster*
Affiliation:
Department of Zoology, Universidade Federal do ParanáPO Box 19.020, 81531-990 Curitiba, PR, Brazil
*
*Author for correspondence Fax: 55 041 32662042 E-mail: foerster@ufpr.br

Abstract

Temperature is considered to be an important abiotic factor influencing insect reproduction. Despite the importance of Plutella xylostella L. (Lepidoptera: Plutellidae) as a pest of brassicaceous crops worldwide, the effects of temperature on its reproduction are not well understood. We evaluated the effect of constant temperatures ranging from 10 to 32.5°C on the reproduction of P. xylostella and developed an oviposition model for the species. The model combined temperature-dependent parameters of total fecundity, age-specific oviposition rate and age-specific survival. Additionally, we modelled population growth as a function of temperature. The estimated parameters allowed us to discuss the possible consequences of global warming on P. xylostella distribution. Temperature affected the length of pre-oviposition after adult emergence, oviposition period, longevity, total fecundity and egg viability. The model predicted that both daily egg production and length of oviposition period decreased at temperatures below 15°C and above 25°C. Population growth increased linearly with temperature in a range from 10°C to 25°C; however, the model predicted a reduction in population growth at temperatures above 28.6°C. Data suggested that temperature plays a critical role in P. xylostella reproduction, and subtle differences in average temperature could have an impact on its population growth. This is especially important in the context of global climate change, which in turn could alter the distribution and abundance of the pest in some regions of the world.

Type
Research Paper
Copyright
Copyright © Cambridge University Press 2012

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