Tomato chlorotic dwarf viroid
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Tomato chlorotic dwarf viroid (TCDVd)
The viroid causes a stunting and yellowing disease of tomato and is widely distributed in green houses. Some other crops can also become infected. It is mainly transmitted mechanically through contact.
The first symptoms of stunting and chlorosis appear around 1 month after infection. They are similar to those caused by the related Potato spindle tuber viroid. In the advanced stage, the infected plants become necrotic with deformed leaves and fruits and even death of the plants.
Like in other viroids, seed transmission is also suspected. Management involves mainly the use of disease-free planting material.