Abstract

RODRIGUEZ-RODRIGUEZ, José Francisco et al. Selection of Resistance and Sub-lethal Effects of Cypermethrin in the Diamondback Moth (Plutella xylostella L.). Nova scientia [online]. 2021, vol.13, n.26, 00007.  Epub Aug 30, 2021. ISSN 2007-0705.  https://doi.org/10.21640/ns.v13i26.2539.

Plutella xylostella is a major pest of cruciferous crops in more than 100 countries. The main control method for P. xylostella is based on the use of chemical insecticides. However, this moth species is characterized by its rapid development of resistance to almost all insecticides. The application of low concentrations of insecticides can affect the physiology, biochemistry, and ecology of insects. In this study, a cypermethrin resistance selection was performed during eight generations of P. xylostella and the sublethal dose (LC20) of the resistant line and the susceptible line was determined. Later, the sublethal dose was applied to third instar larvae to investigate its effect on the percentage of pupation, weight of pupae, emergence of adults in two generations (parents and offspring), as well as the development times of each phase of development of P xylostella. A decrease was observed in the percentage of formed pupae, emerged adults and pupal weight. On the other hand, the number of oviposited eggs increased when individuals were exposed to the insecticide. The above can be an important factor for the management and control of this pest when problems of resistance to cypermethrin occur.

Keywords : Plutella xylostella; resistance; cypermethrin; sublethal effects; crops; pests; insecticides; pupation; diamondback moth.

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