Insecticidal potential and risk assessment of diamide pesticides against Spodoptera frugiperda in maize crops
Yong Xiao, Xiaonan Wang, Zhenyu Li, Chunmei Lei, Siwei Wang
Abstract
The effectiveness, tolerance, and safety of pesticides must be established before their scientific or rational. This study evaluates the field control efficacy of broflanilide, tetraniliprole, and chlorantraniliprole in combating Spodoptera frugiperda in maize crops, as well as the resistance of S. frugiperda to these three diamide pesticides after exposure. By assessing field control efficiency, toxicity, effects on development and reproduction, and detoxification enzyme activity of these diamide pesticides on S. frugiperda, highlights broflanilide's significant insecticidal potential. A highly sensitive and efficient method using QuEChERS/HPLC MS/MS was developed to simultaneously detect residues of these three pesticides on maize. Initial concentrations of broflanilide, tetraniliprole, and chlorantraniliprole ranged from 2.13 to 4.02 mg/kg, with their respective half-lives varying between 1.23 and 1.51 days. Following foliar application, by the time of harvest, the terminal residue concentrations of these pesticides were all under 0.01 mg/kg. Chronic dietary intake risk assessments and cumulative chronic dietary exposure for three pesticides indicated that the general population's terminal residue concentration was within acceptable limits. Not only does this research provide valuable insights into field control efficiency, insecticidal effects, resistance, residues, and risk assessment results of broflanilide, tetraniliprole, and chlorantraniliprole on maize, but additionally, it also paves the way for setting suitable Maximum Residue Limits (MRLs) values based on pre-harvest interval values, rational dosage, and application frequency. • Broflanilide was the most toxic to the Guangzhou strain of S. frugiperda with LC 50 and LC 25 values. • The proportion of female individuals decreased after insecticide exposure and the reduced egg-laying capacity of females. • Three diamide insecticides at LC 25 significantly reduced GST activity of 3rd instar larvae. • Chronic dietary intake risk assessments for three diamide pesticides on maize were acceptable. • Broflanilide was a noteworthy potential insecticide for Spodoptera frugiperda on maize crops.