Journal of Food, Agriculture and Environment

Effect of various plant extracts and organic emulsifiers on control of rice blast (Pyricularia oryzae)


Se Ji Jang 1, Young Beom Yun 1, Sang Su Kim 2, Dong Young Shin 1, Kyu Hwan Hyun 1, Yong In Kuk 1*

Recieved Date: 2015-12-18, Accepted Date: 2016-03-26


The objective of this research was to determine controlling effects on rice blast (Pyricularia oryzae) in rice plants by using plant extracts from different extraction methods (water, boiling water, fermentation and ethanol) from various plant parts (leaves, stems, fruits and roots) in 20 species from 11 families. Rice blast was completely suppressed by 3% boiling extracts in Rheum palmatum roots, Camellia japonica stems, Pittosporum tobira leaves, and Styrax japonica leaves among 20 plant species from 11 families in the laboratory test. Additionally, in a seedling test, rice injury against rice blast was reduced 77%, 62% and 69% by 3% boiling extracts in Camellia japonica stems, Pittosporum tobira leaves, and Styrax japonica leaves, respectively, compared with non-treated controls. Synergistic effects on suppression rates of rice blast by combination applications of plant extracts and emulsifiers in a laboratory test occurred in treatments of loess sulfur (0.05%) + Rheum palmatum (0.5%), loess sulfur (0.05%) + Pittosporum tobira leaves (0.1%), loess sulfur (0.05%) + Camellia japonica stems (0.75%), and natural emulsifier-B (0.1%) + Rheum palmatum (0.05%), but other treatments did not show any synergistic effects. Rice leaf injury against rice blast was reduced by 67% by combination treatments of extracts of Camellia japonica stems + loess sulfur (0.01%) compared with non-treated controls in a greenhouse condition. Rice growth was not reduced by 0.5-3% Rheum palmatumCamellia japonicaPittosporum tobira and Styrax japonica extracts and 0.5-10% natural emulsifier-A, loess sulfur, brown rice vinegar and natural emulsifier-B. Thus, the plant extracts and emulsifiers may be used for controlling rice blast in organically produced crop fields.


Emulsifiers, plant extracts, Pyricularia oryzae, rice

Journal: Journal of Food, Agriculture and Environment
Year: 2016
Volume: 14
Issue: 2
Category: Agriculture
Pages: 104-110

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