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Related Experiment Videos

Natural variation in baseline data: when do we call a new sample 'resistant'?

Lukas Schaub1, Sylvain Sardy, Gorana Capkun

  • 1Federal Research Station for Plant Production Changins, 1260 Nyon, Switzerland. lukas.schaub@rac.admin.ch

Pest Management Science
|September 18, 2002
PubMed
Summary
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Pear psylla mortality to amitraz showed significant sample variation but no widespread resistance. Bootstrapping predicted future sensitivity, aiding in developing probabilistic criteria for pest resistance management.

Area of Science:

  • Agricultural Entomology
  • Pest Management
  • Insecticide Resistance

Background:

  • Pear psylla is a significant pest in agriculture.
  • Amitraz is a commonly used insecticide for pear psylla control.
  • Monitoring insecticide efficacy and resistance is crucial for sustainable pest management.

Purpose of the Study:

  • To assess the mortality of pear psylla exposed to amitraz using bioassays.
  • To investigate variations in mortality, including sample, temporal, and spatial differences.
  • To develop methods for predicting potential decreases in amitraz sensitivity.

Main Methods:

  • Bioassays were conducted to determine pear psylla mortality rates.
  • Probit analysis was used to calculate LC50 values.

Related Experiment Videos

  • Bootstrapping was employed to calculate prediction intervals for pooled functions.

    • Main Results:

    • Significant variation in mortality was observed between different samples.
    • Temporal and spatial variations were insufficient to indicate widespread resistance.
    • Pooled functions with prediction intervals were calculated to monitor sensitivity changes.

    Conclusions:

    • While sample variation exists, current data does not suggest widespread amitraz resistance in pear psylla populations.
    • Probabilistic criteria for assessing population-level resistance were proposed.
    • Monitoring future sensitivity is recommended for effective pest management.