Evaluation of tomato germplasm for resistance to geminiviruses in Sanarate, GT

         Luis Mejia, Universidad de San Carlos, Project leader

Tomato-infecting begomoviruses are STILL a major production constraint in Guatemala.  This field of Silverado (about 2 ha) was planted with seedlings produced in an essential whitefly-free greenhouse where begomoviruses are not present.  At 35-days-after transplanting, nearly 100% of the plants showed begomovirus symptoms.  The plants tested positive for begomoviruses with a general CP probe (M. K. Nakhla).  Other tomato fields were being planted in this area in western Salama Valley, GT.  This emphasizes the importance of begomovirus resistant hybrids for Gutemala.

  Silverado, nearly 100% begomovirus incidence, 35-days-after transplanting.

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