Bifenthrin resistance in Dalbulus maidis (Hemiptera: Cicadellidae): inheritance, cross-resistance, and stability
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View abstract on PubMed
Summary
This summary is machine-generated.Pyrethroid insecticide resistance in the corn leafhopper (Dalbulus maidis) is inherited in an autosomal, incompletely dominant, and polygenic manner. This resistance is unstable and shows cross-resistance to other insecticides, impacting insect resistance management strategies.
Area Of Science
- Entomology
- Insecticide Resistance
- Pest Management
Background
- Pyrethroids are crucial for managing Dalbulus maidis (corn leafhopper) in Brazil.
- Reported failures in pyrethroid control necessitate understanding resistance mechanisms.
- A bifenthrin-resistant D. maidis strain was selected for laboratory study.
Purpose Of The Study
- Investigate the inheritance pattern of bifenthrin resistance in D. maidis.
- Determine cross-resistance to other insecticide classes.
- Assess the stability of bifenthrin resistance in D. maidis populations.
Main Methods
- Selection of a bifenthrin-resistant D. maidis strain under laboratory conditions.
- Conducting reciprocal crosses and backcrosses to analyze inheritance.
- Testing cross-resistance to lambda-cyhalothrin, imidacloprid, acetamiprid, methomyl, carbosulfan, and acephate.
- Evaluating resistance stability through cage studies with varying resistant/susceptible ratios and field-collected populations without selection pressure.
Main Results
- A 3,170-fold resistance ratio (RR) to bifenthrin was observed in the selected strain (Bif-R) compared to the susceptible (Sus) strain.
- Resistance inheritance is autosomal, incompletely dominant, and polygenic.
- Significant cross-resistance was found with lambda-cyhalothrin, imidacloprid, and acetamiprid (300- to 2,000-fold RR).
- No cross-resistance was detected with methomyl, carbosulfan, or acephate.
- Bifenthrin resistance in D. maidis is unstable, with a notable decrease in LC50 in field populations after removal of selection pressure.
Conclusions
- The study elucidates the genetic basis and inheritance of bifenthrin resistance in D. maidis.
- Findings highlight potential cross-resistance issues, crucial for insecticide selection.
- The instability of resistance suggests that Insect Resistance Management (IRM) strategies can be effective in preserving insecticide efficacy.
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