Abstract
Diseases caused by geminiviruses are widespread in the tropical-subtropical tomato production areas. Tomato yellow mosaic geminivirus (ToYMV) is a member of the whitefly-transmitted subgroup (III), which is vectored by the whitefly Bemisia tabaci. Several accessions of Lycopersicon chilense, L. hirsutum, and L. peruvianum var. glandulosum were identified that exhibit tolerance or a high degree of resistance to a Venezuelan isolate of ToY MV in field and greenhouse studies using mechanical inoculation and viruliferous vectors. Polymerase chain reaction analysis showed that viral DNA is present in infected plants and absent in resistant ones. Mechanical and insect transmission gave different results in some species or cultivars, suggesting a distinct mechanism for resistance
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