Why are citrus tree leaves curled?

Curled leaves on citrus trees can be a sign of nutrient deficiency, such as a lack of nitrogen, phosphorus, or potassium. Nitrogen deficiency is a common cause of curled leaves, and it can be corrected by applying a nitrogen-based fertilizer.

Drought Stress

Curled leaves can also be a sign of drought stress. When a citrus tree does not receive enough water, its leaves will curl in order to reduce the surface area that is exposed to the air and thus lose less water.

Pests and Diseases

Curling leaves can be a symptom of various pests and diseases, including aphids, spider mites, and scale insects. These pests can damage the leaves, causing them to curl and distort. Fungal diseases, such as citrus tristeza virus and citrus canker, can also cause curled leaves.

Other Causes

Other causes of curled leaves on citrus trees include:

* Wind damage: Strong winds can cause citrus leaves to curl and twist.

* Herbicide damage: Some herbicides can cause citrus leaves to curl.

* Cold damage: Citrus trees that are exposed to cold weather can develop curled leaves.

Treatment

The treatment for curled leaves on citrus trees will depend on the cause. If the cause is a nutrient deficiency, then applying a fertilizer containing the missing nutrients will correct the problem. If the cause is drought stress, then watering the tree regularly will help to resolve the issue. If the cause is a pest or disease, then treating the tree with an appropriate pesticide or fungicide will be necessary.