Flea beetles prefer young plants that are not yet mature or just reaching maturity. The flea beetle attack signs include irregular holes in the leaves of pepper plants. These holes are very specific to flea beetles.
Grasshoppers mostly eat leaves, but they will chew on flowers, stems, and seeds. The pepper plant is not their favorite meal, but they will chew on them in the absence of food.
Tomato and tobacco hornworms are caterpillars of hawk moths. It is one of the most destructive pests in tomato family plants. This includes peppers, tomatoes, tomatillos, eggplants, and tobacco.
If there is a large population of cabbage loopers or a lack of cabbage family plants, these pests will feed on the leaves of other vegetables such as peppers, peas, potatoes, squash, spinach, lettuce, cucumbers, tomatoes, and watermelons.
In the absence of potatoes, Colorado potato beetles will gladly chew on Nightshade family plants like peppers, tomatoes, eggplants, and tobacco.
Aphids are small sap-sucking insects. Aphids will not make visible holes in your pepper plant. However, as they suck plant sap, they reduce the overhaul health of the plant. Weak and stressed pepper plants will attract more pests which will make visible holes in leaves.