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http://dx.doi.org/10.5660/KJWS.2012.32.2.98

Effect of Yacon (Smallanthus sonchifolius H. Robinson) Extracts on Herbicidal, Fungicidal, and Insecticidal Activities  

Yun, Young-Beom (Dept. of Development in Resources, College of Life Science and Natural Resources, Sunchon National University)
Kim, Jin-Hwa (Dept. of Development in Resources, College of Life Science and Natural Resources, Sunchon National University)
Jang, Se-Ji (Dept. of Development in Resources, College of Life Science and Natural Resources, Sunchon National University)
Kim, Do-Ik (Jeonnam Agricultural Research and Extension Service)
Kwon, Oh-Do (Jeonnam Agricultural Research and Extension Service)
Kuk, Yong-In (Dept. of Development in Resources, College of Life Science and Natural Resources, Sunchon National University)
Publication Information
Korean Journal of Weed Science / v.32, no.2, 2012 , pp. 98-106 More about this Journal
Abstract
This research has been carried out to find out the highest effect on insecticidal, fungicidal and herbicidal activities in leaves, stem and tuber extracts of yacon (Smallanthus sonchifolius) and extraction methods such as water, boiling water and methanol. Characteristics of potential herbicidal components among extraction methods were investigated by solvent fractions such as hexane, chloroform, ethyl acetate, butanol, and water. Generally, methanol extract was the best on inhibition of germination rate, plant height, and root length in cucumber and barley. On the other hand, the inhibition effect on growth in cucumber and barley was the best in tuber among plant parts of yacon. Inhibition of germination rate, plant height, and root length in cucumber and barley in solvent fractions was the best in water fraction, but there were no differences in other fractions. Digitaria sanguinalis L. and Solanum nigrum L. by 5 and 10% extractions of yacon tuber were controlled by more than 70~80% and 95~100%, respectively. However, there was no inhibition effect on foliar treatment in cucumber and barley as affected by 5 and 10% extractions of yacon tuber. Mortality of green peach aphid (Myzus persicae Sulzer) was 50% at 3 days after treatment of 5% extracts of yacon leaves. Mortality of brown plant hopper (Nilaparvata lugens Stal) was only 24% in 5% extracts of stems and leaves with midrib, but was 57% in 5% extracts of leaves without midrib. There was no fungicidal effect on anthracnose (Colletotrichum truncatum), wilt disease (Fusarium oxysporum), verticillium wilt (Verticillium dahliae), bacterial blight (Xanthomonus oryzae) in 5% extracts of yacon leaves.
Keywords
fungicidal activity; herbicidal activity; insecticidal activity; plant extract; yacon;
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