Agrobacterium vitis (A. vitis) is the bacterial agent that causes grape crown gall. An infected vineyard can have severe economic consequences for grape production.
Current management strategies for preventing crown gall include planting resistant rootstock, planting in field sites without a history of grown gall, and using planting material free of pathogens.
Yet, A. vitis persists systemically in grape vines. This presents grape growers an additional challenge: Although nursery stock may appear non-infected, cuttings may still carry the pathogen. Once A. vitis is present in a grape field, it can persist for years in both living and dead grape tissue. Thus, the best solution for preventing crown gall is to use clean plant material.
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Source: Cornell University
