Hello!
A case of supposed Tobacco Etch Virus :
First I noticed one plant with curled leaves :
Only one of 24 plants had this problem.
A few days later, brown spots colonized the leaves…
… and several other plants were contaminated (non-contiguous).
Now, a few weeks later, only 4 plants remain totaly free of disease although most are not as affected as that given above in example (The Vuelta Abajo variety seems to be more affected).
Johnlee1933's assertion make sense in my case because the land used had previously hosted potatoes and there are some nearby.
I noticed that the plants that remained healthy were not injured (no suckers or leaves removed).
The most affected plants are those that had precocious suckers to remove (these were removed with a disinfected tool).
The time has come to top now and I'm affraid to do so… should I avoid any kind of injure with the healthy plants in order to save them from the virus? And if I don't top, would it decrease the quality of the crop?