Relationship between imidacloprid residues and control effect on cotton aphids in arid region
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ORIGINAL PAPER
Relationship between imidacloprid residues and control effect on cotton aphids in arid region Menglei Jie . Youhua Gao . Daihong Kuang . Yingshuang Shi . Huanhuan Wang . Weiwen Jing
Received: 21 April 2020 / Accepted: 4 November 2020 Ó Springer Nature B.V. 2020
Abstract 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
M. Jie Y. Shi H. Wang (&) W. Jing (&) Applied Chemistry Laboratory, College of Chemical Engineering, Xinjiang Agricultural University, Urumqi 830052, Xinjiang Uygur Autonomous Region, People’s Republic of China e-mail: [email protected] W. Jing e-mail: [email protected] Y. Gao College of Agriculture, Xinjiang Agricultural University, Urumqi 830052, Xinjiang Uygur Autonomous Region, People’s Republic of China D. Kuang College of Mathematics and Physics, Xinjiang Agricultural University, Urumqi 830052, Xinjiang Uygur Autonomous Region, People’s Republic of China
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. Keywords Imidacloprid dissipation Control effect Cotton
Introduction Pesticides are extensively used in agricultural production to achieve largely increasing crop productivity and continuously improving the quality of products for the rapidly growing population (Oerke and Dehne 2004). However, considerable evidences show that the indiscriminate and massive use of pesticides in crop protection operation are likely to exert adverse impacts on human health and quality of the environment (Cheng 1990; Jansen et al. 2011). Cotton is one of the main cash crops in China. Annual cotton production in China ranks first in the world, accounting for approximately 25% of total
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Environ Geochem Health
global yield. Xinjiang Uygur Autonomous Region produces about 5 million tons of cotton with an area of more than 2.4 thousand hm2 (Statistics Bureau of Xinjiang Uygur Autonomous Region 2018), making this area the largest producer in China. The cotton aphid (Aphis gossypii Glover) is a major
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