Which virus causes leaves to curl and turn yellow?

The virus that causes leaves to curl and turn yellow is, in fact, the Leaf curl virus. This virus is recognized for its specific symptoms, including the characteristic curling and yellowing of leaves, which can severely affect the growth and yield of plants. The Leaf curl virus often targets various plant species and can lead to significant agricultural challenges.

Mosaic viruses, on the other hand, commonly result in mottling or various patterns of discoloration on the leaves, rather than causing the characteristic curling and yellowing. Blight viruses typically lead to tissue necrosis and death of leaves or entire plants but do not specifically cause the curling and yellowing effect associated with the Leaf curl virus. Similarly, smut viruses are known for causing galls or other growth abnormalities, not typically related to leaf curling or yellowing.

Understanding these specific symptoms can help in the identification and management of plant diseases, enabling more effective agricultural practices.