Fabrication of sulfoxaflor‐loaded natural polysaccharide floating hydrogel microspheres against Nilaparvata lugens (Stal) in rice fields. Issue 9 (26th April 2020)

• Record Type: Journal Article
• Authors: Yang, Liupeng; Wang, Shiying; Ma, Qianli; Song, Zixia; Hou, Ruiquan; Huang, Suqing; Cheng, Dongmei; Zhang, Zhixiang
• Is Part Of: Pest management science. Volume 76:Issue 9(2020)
• Page Start: 3046
• Page End: 3055
• Publication Date: 2020-04-26
• Subjects: sulfoxaflor -- chitosan -- sodium alginate -- Nilaparvata lugens (Stal) -- control effect; Pests -- Control -- Periodicals; Pesticides -- Periodicals; 632.9
• DOI: 10.1002/ps.5855
• Languages: English
• ISSNs: 1526-498X

Abstract

Abstract: BACKGROUND: Nilaparvata lugens (Stal) nymphs and adults aggregate and feed on leaf sheaths at the base of rice plants. It is difficult to apply traditional spray treatments directly onto the plant stems due to the blocking agent produced by leaves. Further, spiders and mirids, the natural enemies of N. lugens (Stal), are directly exposed to the chemicals during spraying. Sulfoxaflor‐loaded natural polysaccharide microspheres with good performance were developed and tested in rice fields. The absorption, distribution, and dissipation of sulfoxaflor in rice plants, soil, and water were examined. RESULTS: Sulfoxaflor‐loaded natural polysaccharide microspheres were prepared through physical embedding and ionic crosslinking, using citronellol as an oil phase to provide floatation. The sustained release of sulfoxaflor was achieved through swelling and dissolution, indicating that these structures could effectively control pesticide release. Field experiments showed that these microspheres were able to float in water and gather around the stem of rice plants and that their insecticidal effect was remarkably improved compared to that achieved using the suspension concentrate. Results also showed that the residual content of stems following treatment with sulfoxaflor‐loaded natural polysaccharide microspheres reached 0.331 mg kg –1, but was reduced in other parts of the plant. CONCLUSION: In the present study, sulfoxaflor‐loaded natural polysaccharide microspheres with optimized properties were successfully prepared. These microspheres produced a better control effect on N. lugens (Stal) compared to the use of the sulfoxaflor suspension concentrate. Their application may help promote the scientific control of target pests in rice fields. © 2020 Society of Chemical Industry Abstract : Sulfoxaflor‐loaded natural polysaccharide microspheres with sought‐after properties were successfully prepared. The sulfoxaflor‐loaded natural polysaccharide microspheres had a better control effect on Nilaparvata lugens (Stal) compared to the sulfoxaflor suspension.