Residues of Thiamethoxam 12.6%+ Lambda Cyhalothrin 9.5%ZC in Vegetable Cowpea

Reddy, Banka Kanda Kishore; Paul, Ambily

doi:10.5958/0974-8172.2020.00223.0

Cited by 1 publication

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“…3A ), these findings are consistent with the absorption and transport characteristics of the 2 insecticides that have been observed on other crops ( Stamm et al 2016 , Ge et al 2017 , Tang et al 2020 , Zhu et al 2021 ). However, 30 days after root treatment of imidacloprid and thiamethoxam, they were still detected in cowpea leaves at levels of 7.64–66.59 and 25.29–187.46 mg/kg, respectively, which shows significantly longer persistence than that of foliar applications of NEOs ( Liu et al 2014 , Chen et al 2021 , Reddy and Paul 2021 , Wang et al 2022 ) and in other crop systems ( Abd-Ella 2014 , Abdella et al 2015 , Nassar et al 2015 ). Our results reveal different dissipation trends of the insecticides in soil and in plants.…”

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confidence: 98%

Assessing the effectiveness of imidacloprid and thiamethoxam via root irrigation against Megalurothrips usitatus (Thysanoptera: Thripidae) and its residual effects on cowpea

Yu,

Tariq,

Guo

et al. 2023

Journal of Economic Entomology

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Systemic neonicotinoid insecticides (NEOs) applied by seed-treatment or root application have emerged as a prevalent strategy for early-season insect pest management. This research investigated the effectiveness of imidacloprid and thiamethoxam, administered through root irrigation, in managing thrips in cowpea [Vigna unguiculata (Linn.) Walp.], and the residual properties of both insecticides in cowpea and soil. The results show that thrips density depends on the application rate of insecticides. At the maximum application rate (1,500 µg/ml, active ingredient), imidacloprid and thiamethoxam controlled thrips densities below the economic injury level (EIL, the EIL of thrips on cowpea was 7/flower) for 20 days and 25 days with the density of 6.90 and 6.93/flower at the end of the periods, respectively. Imidacloprid and thiamethoxam residues decreased gradually over time and decreased sharply after 15 days after treatment (DAT), the 2 insecticides were not detected (<0.001 mg/kg) at 45 DAT. According to our findings, the application of imidacloprid and thiamethoxam via root irrigation proved residual control lasting up to 20–25 days for controlling thrips damage at experimental rates, with a strong association to their residual presence in cowpea (0.6223 < R2 < 0.9545). Considering the persistence of the imidacloprid and thiamethoxam, the maximum tested application rate (1,500 µg/ml) was recommended. As the residues of imidacloprid and thiamethoxam were undetectable in cowpea pods at all tested rates, it may be suggested that the use of each insecticide is safe for consumers and effective against thrips, and could be considered for integrated thrips management in the cowpea ecosystem.

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