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Symptoms on WCLaV-1- and WCLaV-2-infected watermelon leaves in the field (A) sample KF-1, crinkling, and mosaic, on the leaves of watermelon plants used for small RNA-sequencing for WCLaV-1 in 2015; (B) sample KF-15, cluster/crinkling on the top of leaves used for RNA-sequencing for WCLaV-2 in 2016; (C) symptomless leaves from uninfected watermelon plants. Red arrows in (A,B) indicate the crinkle leaf symptom.
