Symptoms
Symptoms of zinc deficiency appear on young leaves first. They show yellow patches in the interveinal areas (mottle leaf).
Along the veins, an irregular green border remains.
The youngest leaves look small and trim (little leaf) and are often upright.
Reasons
Zinc deficiency on leaves of orange.
Manganese deficiency causes similar symptoms.
Please note that this symptom may be a sign of HLB/Citrus Greening, and not a nutrient deficiency.