Il controllo dei nematodi nelle colture ortive: prove in vitro con i tannini di Castagno.

The effect of chestnut tannins was evaluated against some biological stages of Meloidogyne incognita. The nematicidal activity was tested at two concentrations (2-5 g/l) with and without bisulphite, for periods varying between 11 and 22 days. Treatment of 2 g/l of tannin stimulated significantly the embryogenesis and the juvenile hatching from unsegmented eggs, whereas treatment at higher dose inibited and delayed the embryogenesis reducing the atching rate from eggs. This vegetable product revealed a very significant action on free juveniles motility showing nematostatic and mainly nematicidal properties at higher concentration. Finally tannin exhibited a significant inhibitory effect in hatching of juveniles included in eggmasses. All these properties make of this by-product an interesting means for a new control strategy in nematode pest management.