Your pepper plants, eggplant and tomatoes are all part of the Solanaceae or nightshade family, which is quite susceptible to disease, usually viral, via the leaves. It is important to keep the leaves of a plant in the nightshade family off the ground and, if possible, to avoid consistent watering of the leaves. Leaves touching the soil is a pathway for disease and wet leaves encourage disease. Tomatoes respond very well to hard pruning, particularly indeterminates, and this can help focus the plant on fruiting rather than producing suckers. Peppers and eggplant don't have the issue with suckers, but the watering and leave regimen is the same as tomato plants.
If the leaves were rolled together, that usually is an indicator of early blight from too much watering. Tomatoes need a dry out period between waterings. Blight can be overcome, but it is a fungus that can kill a plant if not corrected. Some gardeners are so anal they prune tomatoes with shears that have been "sterilized" with isopropyl alcohol so as to not cross contaminate.
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