Susceptibility of Hypsipyla grandella (Lepidoptera: Pyralidae) to Bacillus thuringiensis strains
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Faculty of Agronomy and Veterinary Medicine, University of Brasília, Brazil
Department of Plant Pathology, University of Brasília, Brazil
Laboratory of Entomopathogenic Bacteria, Embrapa Genetic Resources and Biotechnology, Brazil
A - Research concept and design; B - Collection and/or assembly of data; C - Data analysis and interpretation; D - Writing the article; E - Critical revision of the article; F - Final approval of article
Marcelo Tavares de Castro   

Faculty of Agronomy and Veterinary Medicine, University of Brasília, 70910-900, Brazil
Submission date: 2017-11-12
Acceptance date: 2018-01-23
Journal of Plant Protection Research 2018;58(1):102–105
The use of Bacillus thuringiensis (Bt) to control insect pests is already established in various agronomic and forest crops, being a bacterium that has no polluting effect on 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 determine the lethal concentration 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 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.
The authors have declared that no conflict of interests exist.
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