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Vit.En.

Vit.En

Rogna

Rogna

Il batterio che la provoca è Agrobacterium tumefaciens, diffuso soprattutto in ambienti freddi e umidi. Penetra nella pianta attraverso ferite causate dal gelo. I sintomi, visibili soprattutto sul tronco, consistono in proliferazioni anomale (iperplasie) di dimensioni variabili. In seguito la pianta manifesta germogli ridotti e talvolta muore.

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