Symptoms
Younger leaves show interveinal chlorosis and necrosis which occurs in irregular patches. Whitish spots develop within the brown necrotic tissue.
Symptoms may also start on older leaves.
Reasons
Zinc deficiency
Potatoes: 1 l/ha one week after 100% emergence. For moderate to severe deficiency, repeat applications may be necessary at 10 to 14 day intervals. Also, 1 l/ha following petiole analysis, during tuber bulking. Water rate: 200 l/ha.
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