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Control of Late Blight of Tomato and Potato by Oilgochitosan
Res. Plant Dis. 2011;17:129-135
Published online August 30, 2011
© 2011 The Korean Society of Plant Pathology.

최용호 ( Yong Ho Choi ) , 최경자 ( Gyung Ja Choi ) , 김병섭 ( Byung Sup Kim ) , 장경수 ( Kyoung Soo Jang ) , 윤미영 ( Mi Young Yoon ) , 박명수 ( Myoung Soo Park ) , 김진철 ( Jin Cheol Kim )
cc This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
Chitosan is a linear polysaccharide composed of randomly distributed β-(1-4)-linked D-glucosamine and Nacetyl- D-glucosamine. There have been many reports on the induced systemic resistance and in vivo antifungal activities of higher molecular weight chitosans with molecular weights over 3,000 amu (atomatic mass unit), but there are few papers on in vivo antifungal activities of low molecular weight chitosans (oligochitosans) with molecular weights less than 3,000 amu. In our study, an oligochitosan sample (320?3,000 amu) showed a potent 1-day protective activity with control values more than 94% at concentrations of 500 and 1,000 ?g/ml especially against tomato late blight caused by Phytophthora infestans under growth chamber conditions. It also displayed a moderate 1-day protective activity with control values of 67?89% at concentrations of 500 and 1,000 ?g/ml against wheat leaf rust and red pepper anthracnose. On the other hand, it showed a 16-hr curative activity against red pepper anthracnose, but not against tomato late blight and wheat leaf rust. In field experiments, oligochitosan effectively suppressed the development of late blight on potato and tomato plants with control values of 72% and 48%, respectively. The results strongly indicate that oligochitosan can be used as an eco-friendly organic material for the control of late blight on tomato and potato plants.
Keywords : Control, Oligochitosan, Organic material, Phytophthora infestans, Tomato Late blight


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