Abstract

DIEZ-RODRIGUEZ, GABRIELA I.  and  OMOTO, CELSO. Inheritance of lambda-cyhalothrin resistance in Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae). Neotrop. Entomol. [online]. 2001, vol.30, n.2, pp. 311-316. ISSN 1519-566X.  http://dx.doi.org/10.1590/S1519-566X2001000200016.

Inheritance of lambda-cyhalothrin resistance in Spodoptera frugiperda (J.E. Smith) was investigated in a strain of S. frugiperda showing an intensity of resistance of approximately 13-fold. Results from reciprocal crosses between susceptible (S) and resistant (R) strains of S. frugiperda to lambda-cyhalothrin revealed that resistance was autossomal and conferred by an incompletely recessive gene. Then, backcrosses of F₁ progenies to the R strain were performed to determine the number of genes involved in the resistance. From interpretation of chi-square analysis of responses of progenies from backcrosses suggested that the resistance was conferred by a single major gene under a influence of some minor genes.

Keywords : Insecta; fall armyworm; corn; genetics of resistance; pyrethroid.