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. 2020 Apr 10;9(4):492. doi: 10.3390/plants9040492

Figure 4.

Figure 4

SPVD incidence rates through friction inoculation. SPVD incidence rates of 10 sweet potato varieties through friction inoculation of top leaves (A), branch leaves (B), stems (C), and branches (D). Error bars represent standard errors. The friction inoculation was performed twice in July, 2014. The number of symptomatic plants was recorded at 9-day intervals from the date on which the first symptomatic plant was detected. The storage roots were collected and planted in 2015 to further survey the latent virus.