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Department of Applied Plant Science, Kangnung National University, Gangneung 210-702, Korea(Received on June 9, 2011; Revised on June 30, 2011; Accepted on June 30, 2011)Chitosan is a linear polysaccharide composed of randomly distributed s-(1-4)-linked D-glucosamine and N-acetyl-D-glucosamine. There have been many reports on the induced systemic resistance and in vivoantifungal activities of higher molecular weight chitosans with molecular weights over 3,000 amu (atomaticmass 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 −3,000amu) showed a potent 1-day protective activity with control values more than 94% at concentrations of 500and 1,000 µg/ml especially against tomato late blight caused by Phytophthora infestans under growth chamberconditions. It also displayed a moderate 1-day protective activity with control values of 67−89% atconcentrations of 500 and 1,000 µg/ml against wheat leaf rust and red pepper anthracnose. On the otherhand, it showed a 16-hr curative activity against red pepper anthracnose, but not against tomato late blightand wheat leaf rust. In field experiments, oligochitosan effectively suppressed the development of late blighton potato and tomato plants with control values of 72% and 48%, respectively. The results strongly indicatethat oligochitosan can be used as an eco-friendly organic material for the control of late blight on tomato andpotato plants.Keywords : Control, Oligochitosan, Organic material, Phytophthora infestans , Tomato late blight

Control of Late Blight of Tomato and Potato by Oilgochitosan