DEPENDING upon weather conditions, pathogen population, and walnut variety, walnut blight caused by the bacterium Xanthomonas juglandis can cause significant crop loss. We have measured more than 50% crop damage on the walnut industry's flagship variety, Chandler, when overwintering bud populations were high and spring rainfall favored disease. Conversely, we have measured little to no disease on Chandler walnuts with low bud population levels, even when wet spring weather favored disease.
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