There are two things that can cause such symptoms on pepper plants. The first is tobacco mosaic virus, and the second is aphid damage. If it’s the virus the problem will get worse and you’ll see spots and yellowing of leaves too. There is no cure. This virus can be spread from plant by insects. Read more about it here: http://www.extension.umn.edu/garden/yard-garden/vegetables/tomato-tmv-disease/
The other possibility is aphid damage. If aphids suck out plant juices under the leaves the cells of the plants are then distorted and the plant grows in a crinkled condition. Look carefully under the leaves of the plants to see if there is sign of aphids or aphid litter. Aphids can be green, white, red or black – the litter can be tiny black or white specs…so small that the underside of the leaf can just look dusty or dirty. Spray the undersides of plants with insecticidal soap if you suspect aphids.
If it’s aphids the plants may grow out of the damage and be fine – viruses on plants usually have no cure.
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