Fig. 4.

The variant-specific RT-PCR detection of Grapevine rupestris stem pitting-associated virus (GRSPaV) in SK74 grapevine plant performed in June 2015 (A), August 2015 (B), and January 2016 (C). The virus was detected from leaf petioles (L), green grape rachis (S) and phloem scrapings from bottom (Pb) or medium (Pm) part of dormant cane. ∑ indicated the proportion of positively/total samples tested. The position of sampled tissues on the plant is shown on the corresponding figure, together with the variant(s) detected: SK704-A (white circles), SK704-B (grey circles), and SK704-C (black circles).