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Resistance of Brazilian diamondback moth populations to insecticides
- Source :
- ResearcherID, Scientia Agricola v.68 n.2 2011, Scientia Agrícola, Universidade de São Paulo (USP), instacron:USP
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Abstract
- Plutella xylostella is a recurring pest on cruciferous crops around the world. In Brazil, it typically requires large number of insecticide sprays, which may lead to fast evolution of resistance. The aim of this study was to assess the susceptibility of Brazilian diamondback moth populations to the insecticides abamectin, deltamethrin, and spinosad. Leaf dip bioassays were used to determine mortality data obtained after 48 h of exposure to insecticides and subjected to Probit analysis. The population from Bonito, state of Pernambuco, Brazil, had the highest toxicity ratio (20.2 - fold) to abamectin compared to the reference population. The LC50 values for deltamethrin ranged from 85.2 to 360.1 mg L-1, demonstrating a high survival of populations in relation to this insecticide field dose rate (7.5 mg L-1). The toxicity ratios of the estimated LC50s, however, were very low (varying from 2.2 - to 4.2 - fold). Most populations exhibited toxicity ratios for spinosad, ranging from 2.3 - to 5.1 - fold, while both the LC50 and LC95 values reflected a high susceptibility to the spinosad field dosage (120 mg L-1). Only the Bonito - PE population resisted to abamectin, while all P. xylostella populations were resistant to deltamethrin, but particularly susceptible to spinosad because of the absence of selection pressure with it in these areas.
- Subjects :
- education.field_of_study
Veterinary medicine
Diamondback moth
Population
Spinosad
Plutella
Biology
biology.organism_classification
susceptibility
Lepidoptera
chemistry.chemical_compound
Deltamethrin
chemical control
chemistry
parasitic diseases
Abamectin
medicine
Bioassay
Animal Science and Zoology
PEST analysis
Plutella xylostella
education
Agronomy and Crop Science
medicine.drug
Subjects
Details
- Database :
- OpenAIRE
- Journal :
- ResearcherID, Scientia Agricola v.68 n.2 2011, Scientia Agrícola, Universidade de São Paulo (USP), instacron:USP
- Accession number :
- edsair.doi.dedup.....0be2381d9c828484bba34454b4f9341c