As with leaf yellowing, any blotching or other irregularity in citrus leaf colour needs to be checked. Pay particular attention to where the blotching occurs; note the symptoms and if in any doubt have tissues analysed.
Crop Nutrition and Citrus Leaf Spotting / Blotching
The first symptoms of potassium deficiency can be yellow/bronze blotches across the leaf margin. These can enlarge and the whole leaf becomes the same yellowish colour.
Molybdenum deficiencies occur as interveinal, yellow spots and are mainly seen in the summer. They are the most severe on acid soils and can be cured by using foliar spray fertilizers.
First stage zinc deficiencies occur as chlorotic leaf spots - known as 'mottle leaf' and/or white interveinal areas with green veins. Take care as this can be confused with manganese deficiency.
See also Citrus Leaf Yellowing.
Recommended Yara Fertilizers for Citrus
Elaborated by our specialists, Yara's nutrition programmes for citrus can help you to achieve excellent crop performance.