INHERITANCE OF DELTAMETHRIN RESISTANCE IN A BRAZILIAN STRAIN OF MAIZEWEEVIL (SITOPHILUS-ZEAMAIS MOTS)

Insecticide-impregnated paper assays were used to analyse the inherita nce of Deltamethrin resistance (2634X) in a DDT-pyrethroid cross-resis tant strain of maize weevil, Sitophilus zeamais Mots., from Brazil. At the KD50 the responses of the F1 hybrid reciprocal crosses were very different and chi2 analyses of the observed responses of F2 and F1-bac kcross progenies provided evidence that a single gene was responsible for resistance. Deltamethrin resistance seems to be controlled by a si ngle recessive sex-linked gene.