Inheritance of Methyl Parathion Resistance in Tobacco Budworm Larvae123

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Abstract
The pattern of inheritance of resistance to methyl parathion in larvae of Heliothis virescens (F.) was studied by cross mating strains that were susceptible (S) or resistant (R) to topical applications. Homozygous, or apparently homozygous, S and R cultures were developed by a procedure of inbreeding and selection of progenies that resulted from single-pair matings. The mode of inheritance of the resistance trait was evaluated from dosage-mortality curves constructed from the response of 3rd-stage larvae to insecticide treatment. The results indicated that the resistance appeared to be influenced by a single major autosomal gene of incomplete dominance. Also, mortality data suggested that other factors of lesser importance may have been involved in the expression of the resistance.