Jan 20 handout - Examples of Adaptations Insecticide...

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1/19/2012 1 Examples of Adaptations Insecticide Resistance via Behavioral Avoidance • The German Cockroach, Blattella germanica , natural habitat Ross, M. 1997. Evolution of behavioral resistance in German Cockroaches (Dictyoptera: Blattellidae) selected with a toxic bait. J. Econ. Entomol. 90: 1482- 1485. The Problem • Baiting for cockroaches popular due to safety issues + effectiveness • Resistance to insecticides in baits arose • The lack of effectiveness could not be attributed to physiological resistance alone
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1/19/2012 2 The Material The Experiment Hypothesis : Decreasing efficacy of toxic baits for cockroach control is at least partially due to selection against individuals that don’t avoid eating the baits. • Modes of resistance development (same as for adaptation to environmental extremes): • Physiological • Behavioral Design • Cockroaches were given a choice between toxic bait (with chlorpyrifos) and dogfood • Individuals that were alive after 5 days were removed
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This note was uploaded on 03/21/2012 for the course ENTOMOLOGY 104 taught by Professor Lewis during the Spring '12 term at UC Davis.

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Jan 20 handout - Examples of Adaptations Insecticide...

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