Use of emulsifiers for control of rice blast and sheath blight in organic rice cultivation

Author:

Se Ji Jang 1†, Ha-il Jung 2†, Young Beom Yun 1, Kyu Hwan Hyun 1, Do-Ik Kim 3, Carol Mallory-Smith 4 and Yong In Kuk 1*

Received 14 December 2014, accepted 30 March 2015.

Abstract

Currently, practices for controlling disease in organically produced rice (Oryza sativa L.) crops are not as effective as conventional ones. The objective of this research was to determine the effectiveness of various organic emulsifiers (natural emulsifier A and B, loess sulphur, brown rice vinegar, and insecticidal soap) on the suppression of fungal pathogens, rice blast (Pyricularia oryzae Cavara) and sheath blight (Rhizoctonia solani Kühn), and rice growth. Suppression activity of emulsifiers on mycelia growth of rice blast was proportional to dosage, and the order of effectiveness was: loess sulphur > natural emulsifier B > insecticidal soap > brown rice vinegar > natural emulsifier A. Rice sheath blight suppression of mycelia growth was also proportional to emulsifier concentration. Rice sheath blight was totally suppressed by 0.5% loess sulphur, 3% brown rice vinegar or insecticidal soap. The order of effectiveness of these emulsifiers was: loess sulphur > insecticidal soap > brown rice vinegar > natural emulsifier B > natural emulsifier A. Rice injuries due to blast infection were significantly reduced by the organic emulsifiers (0.5-10%), compared to untreated control. Therefore, the results suggest that organic emulsifiers could effectively control rice blast and sheath blight without contributing to adverse in rice growth.

Journal: Food, Agriculture and Environment (JFAE)
Online ISSN: 1459-0263

Year: 2015, Vol. 13, Issue 2, pages 213-217.

Publisher: WFL.


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