PURPOSE: To control a bacterial blight by adding a microorganism belonging to the genus Flavobacterium to a nutritive solution used for water culture. ;CONSTITUTION: A microorganism belonging to the genus Flavobacterium, e.g. Flavobacterium-R-13-2 (FERM P-13691) separated from the surface of the root of a tomato (variety: ponterosa, raised by a water-culturing method), is added to a nutritive solution used in water culture in an amount of 5-200000ppm, preferably 10-5000ppm. A bacterial blight to which the microorganism can be applied includes soft rot, the black rot of crucifers, bacterial wilt, the bacterial wilt of tobacco, the bacterial wilt of tomato, the angular leaf spot of cucumber, the halo blight of kidney beans.;COPYRIGHT: (C)1995,JPO
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