I am currently planting some chilli peppers and I noticed that around 4 of my plants are demonstrating similar symptoms. It is appears to be mildly contagious as the problem has spread from 1 plant to a nearby 2 other plants. I am not sure if it is caused by pest or caused by a viral disease.
Picture 1 is in an aerated kratky setup that's sharing a reservoir with 3 other plants. The 3 other plant does not have the same symptom. I think it's unlikely to be a nutritional deficiency.
Picture 2 is in a polybag that's sharing its space with 3 other plants. In that bag, 2 of the plant are demonstrating similar symptoms whereas the other 2 plant looks very healthy.
Picture 3 is also in a polybag that's sharing its space with 1 other plant. The other plant is very healthy and roughly twice the height of the diseased plant despite being fed the same thing and planted within the same time.
Thus to reiterate my question: Am I looking at a pest-infection or a viral-infection? If it's viral, how should I respond to the problem? Should I destroy the whole bag or the infected plant or pull out the healthy plant and replant it elsewhere or what?
Here's a few links to more images of the diseased plant (grainy pic, sorry):