Affected leaves show uneven blotchy yellowing between the veins. With a very mild deficiency, leaf size is only marginally reduced and leaf distortion is minimal (upper photo). A more severe deficiency produces significant leaf distortion and reduction in size, accompanied by the yellowing (lower photo). With a very severe deficiency, the youngest leaves at the end of shoots become yellow, very small and distorted (see symptom on page 13). Also affects fruit (see page 31).