Name the disease in plants that causes a 'mosaic' pattern of discolouration. Write out the full name, not the abbreviation.

The disease in plants that causes a 'mosaic' pattern of discoloration is called "Tobacco Mosaic Virus." This viral infection is one of the most well-studied plant viruses and affects a wide range of plants, particularly tobacco and other members of the Solanaceae family. The symptoms include mottled leaves, stunted growth, and deformities, which can significantly impact the health of the plant and its yield. The virus is easily spread through mechanical transmission, meaning that it can be carried on tools, hands, or even through contact with infected plants. Controlling the spread involves good agricultural practices and using resistant plant varieties.