The leaves of pepper leaves yellowing  turn yellow due to many issues, including water stress, nutrient deficiencies, disease, and pests. This discoloration is called chlorosis, and it shows when environmental factors prevent the plant from producing enough chlorophyll to keep it green. In most cases, the pepper will still grow and produce fruit, but its leaves may wilt or turn yellow.

Overly hot weather or a lack of watering during the dry season can cause peppers to wilt and turn yellow as the plants struggle to produce enough water and nutrients. The good news is that adequate watering usually solves this problem.

From Green to Yellow: Understanding and Resolving Pepper Leaves Yellowing

Peppers and other garden vegetables do best in loose, well-draining soil. Over time, overly compact soil becomes waterlogged and anaerobic, which makes it difficult for the plant to get the oxygen it needs. This can lead to rot, root damage, and the death of the plant.

If the yellowing is in a tiny dot pattern, it’s likely due to insect infestation. Aphids and whiteflies suck the plant juices, diverting them from vital growth functions. Similarly, mites and psyllids suck sap, leaving behind a sticky honeydew that turns the leaves yellow but allows the veins to stay green.

Another possibility is that fungus or a fungal disease is to blame. Look carefully at the yellowing leaves and look for brown spots or a fungus mat around the base of the plant. If you think fungus is the culprit, it’s best to pull out the entire plant and not plant any other nightshade vegetable in that spot for a year.