Relative toxicity of spinosad in spinosad-susceptible and (selected) spinosad-resistant strains, the progeny of reciprocal crosses (F₁: ♀R×♂S and ♀S×♂R) and of backcrosses [F₁ (pooled)×(selected) spinosad-resistant strain] of the tomato borer <i>Tuta absoluta</i>.

All of the concentration-mortality curves followed the probit model based on the χ2 goodness-of-fit test (P>0.05).