Crown Gall Bacteria (Agrobacterium radiobacter var. tumefaciens) on Cotton Roots in Israel. D. Zutra, Division of Plant Pathology, Institute of Plant Protection, Agricultural Research Organization, Volcani Center, Bet Dagan 50 250, Israel. D. Orion, Division of Nematology, Institute of Plant Protection, Agricultural Research Organization, Volcani Center, Bet Dagan 50 250, Israel. Plant Dis. 66:1200-1201. Accepted for publication 12 July 1982. Copyright 1982 American Phytopathological Society. DOI: 10.1094/PD-66-1200.

During a survey of fields with stunted cotton plants in the Hula Valley of Israel, crown galls were observed on the roots of the plants. The cause of the disease was determined to be Agrobacterium radiobacter var. tumefaciens biotype 2. In the fields surveyed, about 60% of the cotton plants were infested with this bacterium. Galls appeared smaller where root-knot nematode (Meloidogyne incognita) populations were controlled in fumigated soil.

Keyword(s):