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KMID : 0903520010440020109
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Journal of the Korean Society of Agricultural Chemistry and Biotechnology
2001 Volume.44 No. 2 p.109 ~ p.115
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Influence of Surfactants on Foliar Uptake of Dimethomorph into Cucumber Plant and Fungicidal Activity to Cucumber Downy Mildew
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유주현/Yu, Ju Hyun
조광연/김정한/임희경/최경자/Cho, Kwang Yun/Kim, Jeong Han/Lim, He Kyoung/Choi, Gyung Ja
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Abstract
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The foliar uptake of dimethomorph induced by several nonionic surfactants was measured in order to study the correlations between the uptake rate of dimethomorph and the fungicidal activity to cucumber downy mildew. Dimethomorph was not absorbed in cucumber leaf in the absence of activator surfactant. And the curative effect of dimethomorph WP to cucumber downy mildew was very low under the concentration of 250 ㎍/㎖. But dimethomorph uptake was remarkably enhanced by addition of nonionic surfactants, such as polyoxyethylene cetyl ether, polyoxyethylene oleyl ether, and polyoxyethylene stearyl ether. And the curative effect to cucumber downy mildew was enhanced with proportion to uptake rate of dimethomorph. The protective effect to cucumber downy mildew, however, tends to decrease with the increase of foliar uptake of dimethomorph.. The uptake rate of dimethomorph to cucumber leaf was proportional to the content of polyoxyethylene cetyl ether in formulation, but was decreased with dilution.
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