Evaluation of tomato germplasm for resistance to begomoviruses in Guatemala
Characteristics scored for each plant: This scale was developed by Dr. Favi Vidavski, the Hebrew University of Jerusalem. An evaluation scale card is helpful for getting started.
Disease severity index (DSI) (0-4)
Stage of fruit (green, breaker, pink, red)
Length in cm (only do length for blocky and roma type fruits)
Firmness (0-50, 25 = OK)
Fruit Color (0-50, 25 = OK)
Weight (grams for potential size of first fruits)
Yield (0-50; 25 = OK)
Vigor (0-50; 25 = OK)
Overall (0-100; 50 = OK)
Green shoulder (g)
Jointless (j2; ja, arthritic joint)
Blossom end scar (nipple) (5=10; 10 perfect; 8 = nipple)
Growth type (determinate, T1; semi-determinate, T8; indeterminate, T=3)
Other characteristics to consider: fruit disorders
[Breeding tomatoes for resistance to geminiviruses in Guatemala]