cause of yellow leaves on pepper plants
Insects may be the cause of yellowed leaves on pepper plants. The most common culprits are root knot nematodes, aphids, whiteflies and spider mites. While the root knot nematodes may not be visible because they affects the roots, in severe cases they may cause pepper plants' foliage to yellow and stunt growth.
Disease like bacterial leaf spot, wilt and phytophthora blight can all cause yellow leaves on a pepper plant. Typically, these diseases will have some other effect on the pepper leaves, such as brown leaf spots in the case of bacterial leaf spot, or wilted leaves in the case of wilt and phytophthora blight.
Yellow Leaves on a Pepper Plant Caused by Pests. Pests can also cause pepper plants with yellow leaves. Pests like mites, aphids and psyllids will suck on the plant and divert nutrients and water. This will cause the pepper plant leaves to turn yellow. If you suspect that the yellow leaves on your pepper plant is caused by pests, treat the plant with an insecticide.
Nutrient deficiencies sometimes result in yellowed leaves. A nitrogen, magnesium or sulfur deficiency may cause yellowing of leaves on pepper plants. Signs of a nitrogen deficiency begin with yellow leaves at the bottom of the plants, and the yellowing travels upward. New leaves may appear light green or slightly yellowed, and growth typically slows.