Relative Resistance to Arsenical Poisoning of two Codling Moth Strains

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Abstract
Codling moth ( Carpocapsa pomonella ) larvae from the Grand Valley of Colorado and the Shenandoah Valley of Virginia were reared at Winchester, Virginia for the purpose of comparing their ability to enter sprayed fruit. Lead arsenate was used at the rate of four pounds in one hundred gallons of water. The Colorado larvae demonstrated a marked superiority over the Virginia larvae in their capacity to enter the sprayed apples. The strains were crossed and the first generation of each cross was less resistant to arsenical poison than the pure strain of Colorado larvae but more resistant than the Virginia larvae.

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