First report of Tomato chlorosis virus infecting tomato crops in Uruguay.
A survey of viral diseases was carried out during 2012 to 2013 in 2 major tomato producing regions in Uruguay (Salto and Canelones). Lower leaves of fruit-bearing plants were observed displaying yellowing and interveinal chlorosis under greenhouse conditions. The symptoms were similar to those associated with magnesium deficiency. However, the chlorosis displayed a tendency to move up affecting medial and apical leaves and prevailed even after supplementary magnesium applications to the soil. Whiteflies (Bemisia tabaci biotype Q and Trialeurodes vaporariorum) were present in all sampling sites The causal pathogen was identified as Tomato chlorosis virus (ToCV) based on genetic (PCR) and pathogenicity analyses. This is thought to be the first formal report of ToCV infecting tomatoes in Uruguay.