Tobacco Budworm: Selection for Resistance to Methyl Parathion from a Field-Collected Strain12

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Abstract
Throughout 21 generations, a selected strain of Heliothis virescens (F.) exhibited greater resistance to methyl parathion than a nonselected strain. In crosses of selected and nonselected insects, the male parent from the selected strain produced more resistant offspring than the female parent from this strain. An estimate of heritability of resistance made for generations 1 to 6 of the selected strain indicated that 78% of the variation was due to additive gene action. Selection with an 80% lethal dose was applied to eight generations, but the response for resistance weakened in the later generations.