Control efficacy and joint toxicity of metaflumizone mixed with chlorantraniliprole or indoxacarb against the fall armyworm, Spodoptera frugiperda

• Published in: Pest management science Vol. 79; no. 3; pp. 1094 - 1101
• Main Authors: Wu, Yu‐Jie, Wang, Bing‐Jie, Wang, Meng‐Ru, Peng, Ying‐Chuan, Cao, Hai‐Qun, Sheng, Cheng‐Wang
• Format: Journal Article
• Language: English
• Published: Chichester, UK John Wiley & Sons, Ltd 01.03.2023; Wiley Subscription Services, Inc
• Subjects: Agricultural practices; Animals; Artificial diets; Benzoates; Benzoic acid; Bioassays; Chemical pest control; chlorantraniliprole; co‐toxicity coefficient; Economic impact; Effectiveness; Grain crops; indoxacarb; Insecticide Resistance; Insecticides; Insecticides - pharmacology; Integrated pest management; Laboratory tests; Larva; Larvae; metaflumizone; Mixtures; Pest control; Pesticides; Pests; Spodoptera; Spodoptera frugiperda; Synergistic effect; Toxicity; metaflumizone; Spodoptera frugiperda; indoxacarb; chlorantraniliprole; co-toxicity coefficient
• ISSN: 1526-498X; 1526-4998
• DOI: 10.1002/ps.7278

BACKGROUND The fall armyworm (FAW), Spodoptera frugiperda is the main destructive pest of grain crops, and has led to substantial economic losses worldwide. Chemical pesticides are the most effective way to manage FAW. Here, a laboratory test using an artificial diet‐incorporated assay was conducted to determine the toxicity of five insecticides and the joint effect of the binary combination insecticides to FAW larvae. A field plot test using foliar spray was carried out to assess the control efficacy of metaflumizone mixed with chlorantraniliprole or indoxacarb against FAW. RESULTS The bioassay results showed that metaflumizone had a stronger insecticidal effect than indoxacarb toward FAW larvae. Furthermore, the mixture of metaflumizone and chlorantraniliprole in a volume ratio of 3:7 had the strongest synergistic effect against FAW, with a co‐toxicity coefficient (CTC) of 317.18. The best synergistic effect for mixtures of metaflumizone and indoxacarb was observed at a 1:9 volume ratio, with a CTC of 185.98. However, there was an antagonistic effect of metaflumizone mixed with emamectin benzoate and with lufenuron, because the co‐toxic factor was less than −20 at volume ratios of 8:2 and 9:1, respectively. According to the results of the field trial, metaflumizone mixed with chlorantraniliprole or indoxacarb at a 50% reduction of the application rate can effectively control FAW with efficacy ranging from 77.73% to 94.65% 1–7 days postapplication. CONCLUSION Overall, our findings suggest that metaflumizone and its binary combination insecticides can be utilized in FAW integrated pest management programs. © 2022 Society of Chemical Industry. This study suggested that metaflumizone is an alternative in fall armyworm (FAW) resistance management. Moreover, metaflumizone mixed with chlorantraniliprole or indoxacarb had a synergistic effect against FAW in laboratory and field plot tests.