Citrus leaf bronzing

Leaf bronzing is a typical symptom of phosphorus deficiency. Leaves are smaller than normal and older leaves die at the tips and margins.

While most citrus trees will shed and lose leaves, any bronzing should be checked. 

As the deficiency progresses, leaves become dark green.

Growers should check using tissue analysis and apply the appropriate fertilizer to the leaf to ensure supplies of the deficient nutrient are not limiting growth.