Symptoms
Magnesium deficiency symptoms are visible on older leaves first. They show intercostal chlorosis beginning from the leaf margins and leaf tips and spreading over the whole leaf. A green margin remains around the veins.
Yellowing is followed by necrotic spots which appear in the chlorotic zones.
Causes
Magnesium deficiency.
Mg deficiency can be easily mixed up with K deficiency as both show chloroses beginning on older leaves, followed by necroses. With K deficiency, the leaves have a more blue-green color and the leaf blade is more crinkled.
Mn deficiency also shows similar symptoms, but those start on younger leaves.
An infestation with beet yellow virus (BYV) or beet mild yellow virus (BMYV) causes similar symptoms to Mg deficiency, but in this case chlorosis starts from the leaf tips and the veins do not remain green.
Sugar Beet: 2-4 l/ha at 4-6 leaf stage, with repeat applications at the above rate at 10-14 day intervals for moderate to severe deficiency. Water rate: 200 l/ha.
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