| virus diseases in the tobacco fields of guilan and western azerbaijan provinces of iran. | tobacco (nicotiana tabacum l.) is one of the important industrial plants in iran. viruses as an important group of plant pathogens cause many losses on the quality and quantity of tobacco crop. there was few information on the types of plant viruses infecting the tobacco fields of guilan and almost no information for western azerbaijan province. during 2005-2007, leaf samples were taken from symptomatic plants in the growing areas of these two provinces. the observed symptoms on plants in the fi ... | 2008 | 19226768 |