Author：Lindsey Burbank ^{1, 2}

¹ Agricultural Research Service, United States Department of Agriculture, San Joaquin Valley Agricultural Sciences Center, 9611 South Riverbend Ave, Parlier, CA 93648-9757, USA
² Corresponding author, e-mail: Lindsey.Burbank@ARS.USDA.GOV

ABSTRACT

    Grapevines infected with Xylella fastidiosa can recover from infection following exposure to cold temperatures. The rate at which vines recover is dependent on duration of cold exposure, cultivar susceptibility, and time of inoculation. Previous studies primarily focused on climate conditions experienced in the northern California wine grape growing regions, and only a small number of cultivars. This study aims to increase available information on probability of vine recovery in warmer regions. Cold treatment representative of southern California climate conditions led to very low rates of recovery in susceptible grapevines. However, even at low chill hour treatments, rate of recovery varied based on cultivar and time of inoculation. Comparison of Xf strains isolated from northern and southern California locations did not show any significant difference in curing under the same conditions. Evaluating the rate at which Xf infected grapevines can be cured by cold temperatures is important for developing regionspecific management strategies, and for understanding pathogen spread in a variety of locations.

Keywords: Xylella fastidiosa, climate, Pierce’s Disease, cultivar, winter-curing

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