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Displacement of Tomato Yellow Leaf Curl Virus (TYLCV)-Sr by TYLCV-Is in Tomato Epidemics in Spain

November 1999 , Volume 89 , Number  11
Pages  1,038 - 1,043

S. Sánchez-Campos , J. Navas-Castillo , R. Camero , C. Soria , J. A. Díaz , and E. Moriones

Estación Experimental “La Mayora,” Consejo Superior de Investigaciones Científicas, 29750 Algarrobo-Costa, Málaga, Spain

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Accepted for publication 23 July 1999.

A progressive displacement of tomato yellow leaf curl virus (TYLCV)-Sr by TYLCV-Is was observed in tomato epidemics in southern Spain based on incidence data of both virus species obtained during surveys conducted between 1996 and 1998. Ecological factors that might be involved in such a displacement, such as competition of TYLCV-Sr and TYLCV-Is in tomato, transmission by local biotypes (B and Q) of Bemisia tabaci, and presence in weeds and alternate crops, have been analyzed. No selective advantage is observed for TYLCV-Sr or TYLCV-Is in tomato plants either infected via Agrobacterium tumefaciens or via B. tabaci. However, TYLCV-Is is more efficiently vectored by local biotypes of B. tabaci; and common bean, a bridge crop between tomato crops, is a host for TYLCV-Is but not TYLCV-Sr. Therefore, common bean acts as a reservoir for TYLCV-Is. These two factors are probably responsible for the displacement of TYLCV-Sr by TYLCV-Is as the causative agent of epidemics in tomato in southern Spain.

Additional keywords: epidemiology, host range, Lycopersicon esculentum, Phaseolus vulgaris, virus displacement.

© 1999 The American Phytopathological Society