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RAPID COMMUNICATION

 

Susceptibility of Hypsipyla grandella (Lepidoptera: Pyralidae) to Bacillus thuringiensis strains

 

Marcelo Tavares de Castro1*, Sandro Coelho Linhares Montalvăo2, Rose Gomes Monnerat3

 

1Faculty of Agronomy and Veterinary Medicine, University of Brasília, Brazil

2Department of Plant Pathology, University of Brasília, Brazil

3Laboratory of Entomopathogenic Bacteria, Embrapa Genetic Resources and Biotechnology, Brazil

 

*Corresponding address:

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Received: November 12, 2017

Accepted: March 20, 2018

 

Abstract

The use of Bacillus thuringiensis (Bt) to control insect pests has already been established in various agronomic and forest crops. It is a bacterium that does not pollute the environment, is safe for mammals and vertebrates, lacks toxicity to plants and specifically targets insects. To date in-depth studies have not been conducted about the use of Bt to control the main pest of mahogany (Swietenia macrophylla King) and other Meliaceae species, the Hypsipyla grandella Zeller (Lepidoptera: Pyralidae). Therefore, this study aimed to test the pathogenicity of Bt strains on H. grandella caterpillars, as well to determine the lethal concentration required to kill 50% of the population (LC50) of the most promising strains. Ten strains of Bt toxic to lepidopteran proven in previous trials were used and these were incorporated into a natural diet with mahogany seeds to check their mortality. The LC50 of the top five strains was determined. The results indicate that H. grandella is highly susceptible to Bt toxins and the S1905 strain is highly toxic. Therefore, the use of Bt strains may be a tool to be incorporated into the integrated management of this important pest.

 

Key words: Bacillus thuringiensis, bioassays, biocontrol, forest pest, mahogany shoot borer

 

 
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