Relationship between imidacloprid residues and control effect on cotton aphids in arid region

• Published in: Environmental geochemistry and health 2021-05, Vol.43 (5), p.1941-1952
• Main Authors: Jie, Menglei, Gao, Youhua, Kuang, Daihong, Shi, Yingshuang, Wang, Huanhuan, Jing, Weiwen
• Format: Article
• Language: English
• Subjects: Animals; Aphids - drug effects; Aphis gossypii; Arid regions; Arid zones; Biodegradation, Environmental; China; Contamination; Control; Cotton; Cropping systems; Dosage; Earth and Environmental Science; Environment; Environmental Chemistry; Environmental Health; Geochemistry; Gossypium - drug effects; Half-Life; Imidacloprid; Insect Control - methods; Insecticides; Insecticides - analysis; Insecticides - pharmacokinetics; Insecticides - pharmacology; Insects; Leaves; Neonicotinoids - analysis; Neonicotinoids - pharmacokinetics; Neonicotinoids - pharmacology; Nitro Compounds - analysis; Nitro Compounds - pharmacokinetics; Nitro Compounds - pharmacology; Original Paper; Pesticide Residues - analysis; Pesticide Residues - pharmacokinetics; Plant Leaves - drug effects; Plant protection; Public Health; Residues; Soil; Soil contamination; Soil Pollutants - analysis; Soil Pollutants - pharmacokinetics; Soil Science & Conservation; Soils; Terrestrial Pollution
• ISSN: 0269-4042; 1573-2983
• DOI: 10.1007/s10653-020-00776-z

In this case, the dissipation and residues of imidacloprid as well as its control efficacy against aphids ( Aphis gossypii Glover) in cotton cropping system were reported. After the final spray at the rates of 10.5–42.5 g a.i. ha −1 , the initial deposits were 0.59–2.25 mg kg −1 with half-lives of 2.12–2.84 days on leaves and 0.06–0.21 mg kg −1 with half-lives of 1.51–4.20 days in soil, respectively. The initial residues were significantly higher with longer persistence in the upper position of the leaf than in middle and lower positions. The different application dosages could induce a significant difference in the initial deposits, but not show consistent correlation with the dissipation rate. The repeated applications of imidacloprid could alter its residue levels and dissipation rates. The long-term residue concentrations of imidacloprid (60 days after the final application) reached to the nondetectable level in soil. Combined with the control efficacy results, it was considered that the recommended dose of imidacloprid on cotton could be used effectively and safe in this arid area from the view of crop protection and environmental contamination.