Evaluation of tomato germplasm for resistance to geminiviruses in Guatemala

Disease Severity Index (DSI)

The DSI is based on a rapid assessment of symptoms: (DSI images)

0) no symptoms

 

1) may be, but not certain

 

2) certain of symptoms, but they are mild

 

3) moderate stunting, serve leaf symptoms

 

4) extremely severe symptoms; plants are very stunted and have severe leaf symptoms

[Breeding tomatoes for resistance to geminiviruses in Guatemala]