Manganese: nm Manganese* is an essential trace element for the good prosperity of the vine.
In the event of a deficiency caused either by a soil that is too calcareous, or by a period of drought or quite simply by overproduction, the leaves turn red or yellow before veraison. The consequences can be serious: coulure, millerandage or poor ripeness.
It must then be treated with a fungicide containing manganese (Mn) and at flowering, spray the fires...
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