Antifungal Activities of Ageratum conyzoides L. Extract against Rice Pathogens Pyricularia oryzae Cavara and Rhizoctonia solani Kühn

Cuong C. Nguyen, Thanh Q. C. Nguyen, Kenji Kanaori, Tran Duy Binh, Xuyen H. T. Dao, Le Van Vang and Kaeko Kamei
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Cuong C. Nguyen: Department of Functional Chemistry, Kyoto Institute of Technology, Kyoto 606-8585, Japan
Thanh Q. C. Nguyen: Department of Functional Chemistry, Kyoto Institute of Technology, Kyoto 606-8585, Japan
Kenji Kanaori: Department of Functional Chemistry, Kyoto Institute of Technology, Kyoto 606-8585, Japan
Tran Duy Binh: Department of Functional Chemistry, Kyoto Institute of Technology, Kyoto 606-8585, Japan
Xuyen H. T. Dao: Department of Plant Protection, College of Agriculture, Can Tho University, Can Tho City 900000, Vietnam
Le Van Vang: Department of Plant Protection, College of Agriculture, Can Tho University, Can Tho City 900000, Vietnam
Kaeko Kamei: Department of Functional Chemistry, Kyoto Institute of Technology, Kyoto 606-8585, Japan

Agriculture, 2021, vol. 11, issue 11, 1-14

Abstract: Blast disease and sheath blight disease caused by infection with Pyricularia oryzae and Rhizoctonia solani , respectively, are serious fungal diseases in paddy fields. Although synthetic fungicides have been used to control these diseases, the development of ecologically friendly alternatives is required because fungicides can cause health problems and environmental pollution. Natural herbs possessing antifungal activities are among the candidates as alternatives. Ageratum conyzoides is known to contain antifungal compounds, such as precocene II and polymethoxyflavones. Here, we report the antifungal activities of five compounds isolated after ethanol extraction from Ageratum conyzoides against Pyricularia oryzae and Rhizoctonia solani in vitro. Further, we demonstrated the protective effect of the extract on rice from Pyricularia oryzae infection by field trial testing in a shaded net-house.

Keywords: antifungal; alternative antimicrobials; plant extracts; Ageratum conyzoides; rice pathogen; Pyricularia oryzae; Rhizoctonia solani (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2021
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