Journal Article

Pest management of a prey–predator model with sexual favoritism

Yongzhen Pei, Yong Yang, Changguo Li and Lansun Chen

in Mathematical Medicine and Biology: A Journal of the IMA

Published on behalf of Institute of Mathematics and its Applications

Volume 26, issue 2, pages 97-115
Published in print June 2009 | ISSN: 1477-8599
Published online November 2008 | e-ISSN: 1477-8602 | DOI:
Pest management of a prey–predator model with sexual favoritism

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  • Applied Mathematics
  • Biomathematics and Statistics


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Although sex of prey is an important factor for the risk of predating, few articles consider the consequences of sexual favoritism and the corresponding effects on the impulsive predator–prey dynamics and its utility in biological control. This paper investigates the pest management strategy of a prey–predator system model with sexual favoritism. An impulsive differential equation which models the process of periodically releasing natural enemies and spraying pesticides at different fixed time for pest control is proposed and investigated. It is proved that the pest-eradication periodic solution is globally asymptotically stable under the assumption that the release amount of the predator is greater than some critical value. Permanent conditions are established under the assumption that the release amount of the predator is less than another critical value. In particular, two single control strategies are proposed. Furthermore, we compare three pest control strategies and find that if we choose narrow-spectrum pesticides that targeted to a specific pest's life cycle to kill the pest, then the combined strategy is preferable. Finally, the corresponding system with no sexual favoritism is investigated. The results indicate that we can release fewer amount of the predators to eliminate the preys with sexual favoritism than without and any strong sexual favoritism will drive the pest towards extinction. In view of the biological meaning, the sexual favoritism plays a more active role in suppressing insect pests.

Keywords: prey–predator system; impulsive control; sexual favoritism; extinction; permanence

Journal Article.  0 words. 

Subjects: Applied Mathematics ; Biomathematics and Statistics

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