Comparative toxicity of spinosad to Frankliniella spp. (Thysanoptera: Thripidae), with notes on a bioassay technique

A bioassay technique was developed and used to determine the toxicity of spinosad to three species of Frankliniella: F. bispinosa, F. occidentalis, and F. tritici. Dose response curves for the three species were similar and regressions of dose/mortality data were highly significant (R2 = 75-85%, P < 0.00001 for all species). 95% confidence intervals around LC10, LC50, LC90 and LC99 values for the three species overlapped, suggesting that there were no significant differences among the three species tested.