Journal of Food, Agriculture and Environment

Effects of various plant extracts and organic emulsifiers on control of powdery mildew (Sphaerotheca fuliginea) in cucumber (Cucumis sativus L.) plants

Author(s):

Se Ji Jang, Young Beom Yun, Yong In Kuk ^*

Recieved Date: 2016-06-10, Accepted Date: 2016-09-20

Abstract:

The objective of this research was to determine controlling value on powdery mildew (Sphaerotheca fuliginea) in cucumber 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 47 species from 28 families. Control value on cucumber powdery mildew was also determined by using mixers of various plant extracts and organic emulsifiers. Finally, we determined leaf injury and shoot fresh weight in cucumber plants by using selected plant extracts and organic emulsifiers. Ethanol extracts of Eclipta prostrata (L.) all parts above ground, Xanthium strumarium L. fruit, and Rheum rhabarbarum L. root and boiling water extract of Coptis japonica (Thunb.) Makino root among 47 plant species from 28 families were more effective on control of powdery mildew and powdery mildew was over 52% controlled by 10% of the plant extracts in a greenhouse test. Cucumber powdery mildew was completely controlled by powder soap at 3%, loess sulphur and brown rice vinegar at 5% and natural emulsifier-B at 10%. The order of controlling value on powdery mildew by organic emulsifiers was loess sulphur > powder soap > brown rice vinegar > natural emulsifier-B > natural emulsifier-A. Synergetic effect on controlling value of powdery mildew appeared in all treatments of plant extract and organic emulsifier mixers. Powdery mildew in cucumber plants was 98% and 92% controlled by third treatments of Rheum rhabarbarum L. extract at 10% + powdery soap at 0.5% and Coptis japonica (Thunb.) Makino at 10% + powdery soap at 0.5%, respectively, compared with untreated control in organic cultivation fields. Cucumber plants did not show any leaf injuries and growth reduction after treatments of the plant extract and emulsifier alone or mixtures. The plant extracts and organic emulsifiers may be used for controlling powdery mildew in organically produced cucumber fields.

Keywords:

Cucumber, organic emulsifiers, plant extract, powdery mildew

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Journal: Journal of Food, Agriculture and Environment
Year: 2016
Volume: 14
Issue: 3&4
Category: Agriculture
Pages: 54-61

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