The mosaic disease of tobacco /

Mosaic" is one of the most serious and widespread diseases known to affect the tobacco plant.This disease also is known locally as "calico," "gray-top," " mottled-top," "mottling," and "foxy" tobacco.Especially in southern tobacco sections the term " frenching " ? is used to designate abnormal, sickly plants characterized by the development of stringy, very thick, and leathery leaves which may be free from mottling.It has not been determined whether this is distinct from mosaic or only a somewhat different phase of this disease.In the tobacco sections of Kentucky and Tennessee " walloon" is often used to denote mosaic or other abnormal appearances more or less closely resembling symptoms of the mosaic disease.The disease has also been termed "chlorosis."Finally, mosaic plants