Plants infected with phytoplasma can show a unique symptom called "witch's broom." It's when the plant's shoots and branches grow in an abnormal way, forming a dense cluster of small, weak twigs that look like a broom.

This symptom is not commonly seen in plants infected with viruses. So if you observe this broom-like growth in a plant, it could indicate a phytoplasma infection rather than a viral infection. Anand Choudhary