Inheritance of Resistance to Permethrin by the Tobacco Budworm, Heliothis Virescens (F): Implications for Resistance Management

A laboratory selected permethrin resistant strain of tobacco budworm. Heliothis virescens (F), was crossed with a susceptible strain to determine the nature of inheritance of the resistance. Crossing of these highly resistant and highly susceptible strains showed susceptibility to permethrin to be auto trial and incompletely dominant. Backcrosses of F₁ progeny with resistant males indicated either that more than one gene is responsible for the resistance in this strain, or that the strain was not homozygous for resistance. It is likely that more than one locus is influencing permethrin resistance. The crosses and backcrosses performed provided relevant information for resistance management in the field