Preparation of alginate–chitosan floating granules loaded with 2‐methyl‐4‐chlorophenoxy acetic acid (MCPA) and their bioactivity on water hyacinth. Issue 9 (24th April 2021)

• Record Type: Journal Article
• Authors: Hou, Ruiquan; Wu, Jiyingzi; Yang, Liupeng; Zhao, Kunyu; Huang, Suqing; Kaziem, Amir E; Zhang, Zhixiang
• Is Part Of: Pest management science. Volume 77:Issue 9(2021)
• Page Start: 3942
• Page End: 3951
• Publication Date: 2021-04-24
• Subjects: chitosan -- sodium alginate -- herbicide -- floating granules -- water hyacinth; Pests -- Control -- Periodicals; Pesticides -- Periodicals; 632.9
• DOI: 10.1002/ps.6414
• Languages: English
• ISSNs: 1526-498X

Abstract

Abstract: BACKGROUND: Water hyacinth ( Eichhornia crassipes ) is considered the most damaging aquatic weed in many countries. Chemical methods are still the primary approach to control, although this directly exposes the natural enemy of water hyacinth (water hyacinth weevil) to herbicides. In addition, spray drift can easily damage non‐target plants. In this study, herbicides, natural polymer materials (chitosan and carboxymethyl chitosan), sodium alginate and natural oils (citronella oil) were used to prepare novel floating polysaccharide granules as a solution for controlling water hyacinth. RESULTS: 2‐Methyl‐4‐chlorophenoxy acetic acid (MCPA) floating granules with a spherical structure were prepared using a MCPA–chitosan–sodium alginate–oil cross‐linking and embedding method. The granules produced showed the required properties of floatation and slow controlled herbicide release. In addition, the polysaccharide granules collected around water hyacinth plants and enabled targeted release of the active herbicide ingredients onto the stems and roots of the weed, thereby stopping the herbicide from reaching non‐target plants and preventing regrowth of water hyacinth. CONCLUSION: We successfully prepared highly effective MCPA‐loaded floating granules, which compared with an MCPA solution, exerted greater control on water hyacinth. Concomitantly, these granules provide a solution to spray drift and ensure the safety of natural enemies of water hyacinth, which is of great significance in research on herbicide formulations. Abstract : Schematic illustration of the preparation of MCPA loaded floating polysaccharide granules and its application for sustainable water hyacinth control © 2021 Society of Chemical Industry.