Safety Evaluation and Sublethal Effects of Cyantraniliprole on Orius sauteri

doi:10.16409/j.cnki.2095-039x.2026.01.022

Abstract

Abstract: This study aimed to clarify the safety of cyantraniliprole and its influence on the fecundity and predation capacity of Orius sauteri at different field-recommended doses. The acute toxicity of cyantraniliprole against O. sauteri at different instar was measured using the glass tube residual film method and safety was evaluated via the safety factor. The effects on female adult O. sauteri were analyzed by measuring longevity, egg number, egg hatch rate, predation amount, predation function response and searching efficiency at two field-recommended doses. The results showed that cyantraniliprole posed acceptably low risk to both the fourth/fifth instar nymphs and male/female adults of O. sauteri, with the lowest toxicity observed in female adults (LC₅₀= 216.78 mg/L, safety factor ranged from 6.45 to 18.43. After treatment with two field-recommended doses of cyantraniliprole at 21 g a.i./ha and 60 g a.i./ha, the average lifespans of female adults were 22.38 and 22.13 days respectively, both significantly lower than that of the untreated control (25.12 days). When paired with male adults, the females in the two treatment groups deposited 120.43 and 99.15 eggs, respectively. Compared with the control group (107.73), the number of eggs in the 21 g a.i./ha treatment group increased significantly by 9.31%. The field-recommended dose of cyantraniliprole increased the predation amount and predation efficiency of female adult of O. sauteri. Under the two tested doses, the maximum predation amounts reached 8.00 and 6.89, respectively. The predation of the female adult O. sauteri in the two cyantraniliprole treatments conformed to Holling II functional response models. The predation efficiency (47.97 and 35.96, respectively) and the maximum search efficiency (0.9023 and 0.7937, respectively) was significantly higher than those in the control (26.7909 and 0.6819). In conclusion, the field-recommended doses of cyantraniliprole demonstrate high safety toward older nymphs and adults of O. sauteri, with no significant negative effects on the reproductive and predatory abilities of female adults. These findings provide a theoretical basis for the combined application of O. sauteri and cyantraniliprole in field pests control programs.

Key words: Orius sauteri, cyantraniliprole, safety evaluation, longevity, fecundity, predation capacity

CLC Number:

S476.2

ZHAO Jun, LI Xinbei, BAI Jingke, LI Chengjun, LI Shujun, LI Jue. Safety Evaluation and Sublethal Effects of Cyantraniliprole on Orius sauteri[J]. Chinese Journal of Biological Control, 2026, 42(3): 555-561.

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