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Am. J. Enol. Vitic. 44:3:241-248 (1993)
Copyright © 1993 by the American Society for Enology and Viticulture.
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Effects of Fumigation and Biological Control on Infection of Indexed Crown Gall Free Grape Plants

XIN-AN PU 1 and R. N. GOODMAN 1

1 Department of Plant Pathology, 108 Waters Hall, University of Missouri, Columbia, MO 65211.

Indexed Agrobacterium-free grape plants, including cultivars resistant and susceptible to crown gall, were planted in an Agrobacterium-infested vineyard soil. The presence of agrobacteria in indexed plants was examined at seasonal intervals between summer 1989 and spring 1991. Agrobacteria became detectable 16 months after planting. More Agrobacterium cells were isolated in spring after the root pressure forced the sap upwards into the trunk. This indicated that the primary source of inoculum was from infested soil. Fumigation with Vorlex decreased the initial inoculum level, and the fumigant and the antagonist A. radiobacter HLB-2 both reduced the occurrence of infection and tumor development.

Key words: crown gall, Agrobacterium, grapevine

Submitted on April 28, 1992






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Copyright © 1993 by the American Society for Enology and Viticulture.