Abstract Sogatella furcifera (Horvath) (Hemiptera: Delphacidae), the white-backed planthopper, is a serious pest insect in rice (Poales: Poaceae) paddy fields in China and elsewhere in Asia, and it is primarily controlled using chemical methods. Triazophos is a broad-spectrum, non-systemic organophosphorus insecticide used for pest control in rice paddy fields. In this paper, we examined the sublethal effects of triazophos on nymphal duration and life table parameters of S. furcifera in the laboratory. The results showed that sublethal concentrations of triazophos could significantly prolong nymphal duration in S. furcifera. Relative to the control, exposure to LC10 and LC25 extended the nymphal period by 0.92 and 3.16 d, respectively. A fitness analysis was performed by constructing a life table in the F1 generation and showed that sublethal concentrations of triazophos could stimulate reproduction in S. furcifera populations. Various life table parameters were depressed under sublethal concentrations of...