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Sweet potato virus disease (SPVD) incidence in 10 sweet potato varieties in the field experiment. (A) SPVD incidence rate calculated during the whole experiment period in 2014. (B) The number of symptomatic leaves recorded in 2014. (C) SPVD incidence rate calculated during the whole experiment period in 2015. (D) The number of symptomatic leaves recorded in 2015. Error bars indicate the standard deviation from two independent replicates.
