Results indicated that foliar spraying of NSi/CTS with 100 ppm NSiand150 ppm CTS were effective against blast and blight diseases on rice (Oryza spp.). The leaf blast disease index (DI) ( %) and the blight DI ( %) were significantly decreased compared with control of % and %, respectively at 14th day after the first treatment. Thus, NSi/CTS hybrid material is promising to use for controlling plant diseases, particularly for rice. | Vietnam Journal of Chemistry, International Edition, 54(6): 719-723, 2016 DOI: Effect of nanosilica/chitosan hybrid on leaf blast and blight diseases of rice in Vietnam Le Nghiem Anh Tuan1, Lai Thi Kim Dung1, Nguyen Quoc Hien2, Dang Van Phu2, Bui Duy Du1* 1 Institute of Applied Materials Science, Vietnam Academy of Science and Technology 2 Research and Development Center for Radiation Technology, Vietnam Atomic Energy Institute Received 22 July 2016; Accepted for publication 19 December 2016 Abstract Nanosilica/chitosan (NSi/CTS) hybrid material was prepared using nanosilica ( nm) from rice husk ash (RHA) and chitosan (CTS), and characterized by transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD). The obtained NSi/CTS was used for protection of rice leaf from blast disease (Piriculariaoryzae) and blight disease (Xanthomonasoryzae). Results indicated that foliar spraying of NSi/CTS with 100 ppm NSiand150 ppm CTS were effective against blast and blight diseases on rice (Oryza spp.). The leaf blast disease index (DI) ( %) and the blight DI ( %) were significantly decreased compared with control of % and %, respectively at 14th day after the first treatment. Thus, NSi/CTS hybrid material is promising to use for controlling plant diseases, particularly for rice. Keywords. Nanosilica, chitosan, blast, blight disease, rice. 1. INTRODUCTION Rice husk ash (RHA) with rich silica content (80-90%) is one of the agricultural by-products. Silica has been widely used in vegetable oil refining, medicine, detergents, adhesives, and ceramics [1]. Various methods have been reported for preparing silica nanoparticles materials in the literature, such as sol–gel [2-4], precipitation [5], hydrothermal and pyrolysis method [6, 7]. CTS attracted much attention from the research communities worldwide due to their unique properties such as biodegradability, .
