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Symptoms induced by Tomato chlorotic dwarf viroid (TCDVd) isolate Trust and Potato spindle tuber viroid (PSTVd) isolate FN in tomato plants. Tomato (cultivar Sheyenne) plants at the four-leaf stage were mechanically inoculated with TCDVd or PSTVd (leaf extract from an infected tomato plant) or buffer (Mock) and grown in the greenhouse. Pictures shown were taken 45 days after inoculation.
