Figure 4. Systemic symptoms caused by PVH in potato cv.

Shepody and Nicotiana glutinosa (N. g.) leaves. (A) Systemic effects on the leaves of potato cv. Shepody at 60 dpi. 1, leaf of mock Shepody plant inoculated with ddH₂O; 2, 3, leaves of Shepody plant inoculated with PVH. (B) N. g. systemic leaves at 53 dpi. 1, Mock N. g. plant inoculated with ddH₂O; 2, N. g. plant inoculated with PVH; 3, leaf of N. g. plant inoculated with ddH₂O (left) and leaf of N. g. plant inoculated with PVH (right).