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Zhang X, He Y, Yuan Z, Shen G, Zhang Z, Niu J, He L, Wang J, Qian K. A pH- and enzymatic-responsive nanopesticide to control pea aphids and reduce toxicity for earthworms. Sci Total Environ 2023; 861:160610. [PMID: 36460117 DOI: 10.1016/j.scitotenv.2022.160610] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2022] [Revised: 11/24/2022] [Accepted: 11/27/2022] [Indexed: 06/17/2023]
Abstract
Thiacloprid is a new chlorinated nicotinoid insecticide against stinging-oral pests, such as aphids. It is less toxic to bees but more toxic to earthworms. In this study, a pH- and amylase-responsive MOF (ZIF-8) was constructed for site-specific delivery of thiacloprid to control pea aphids and more safety for earthworms. Thiacloprid from α-cyclodextrin@Thiacloprid@ZIF-8 (α-CD@T@ZIF-8) could be released quickly in pea aphids, which was ascribed to disintegration of ZIF-8 at low pH values in pea aphid intestines and degradation of α-CD under the action of α-amylase. The release results showed a significant pH dependence of α-CD@T@ZIF-8, with an approximately 65 % release amount at pH = 7 and a 95 % release amount at pH = 5 for 7 d. The results of the pot experiment and biosafety showed that for α-CD@T@ZIF-8, 88 % pea aphids could be killed compared with 32 % aphids for commercially available formulation on the 7th day after application. Meanwhile the LC50 of thiacloprid OD was 0.034 μg/cm2 and the LC50 of α-CD@T@ZIF-8 was 0.564 μg/cm2 on earthworms, and it was more safety for pea and lower acute toxicity and enrichment for the earthworms. α-CD@T@ZIF-8 could be used for intelligently controlled release of other insecticides against aphids.
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Affiliation(s)
- Xuqian Zhang
- College of Plant Protection, Southwest University, Chongqing 400715, China
| | - Ying He
- College of Plant Protection, Southwest University, Chongqing 400715, China
| | - Zitong Yuan
- College of Plant Protection, Southwest University, Chongqing 400715, China
| | - Guangmao Shen
- College of Plant Protection, Southwest University, Chongqing 400715, China
| | - Zan Zhang
- College of Plant Protection, Southwest University, Chongqing 400715, China
| | - Jinzhi Niu
- College of Plant Protection, Southwest University, Chongqing 400715, China; Academy of Agricultural Sciences, Southwest University, Chongqing 400715, China
| | - Lin He
- College of Plant Protection, Southwest University, Chongqing 400715, China; Academy of Agricultural Sciences, Southwest University, Chongqing 400715, China.
| | - Jinjun Wang
- College of Plant Protection, Southwest University, Chongqing 400715, China; Academy of Agricultural Sciences, Southwest University, Chongqing 400715, China.
| | - Kun Qian
- College of Plant Protection, Southwest University, Chongqing 400715, China.
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