WINTER FROST DAMAGES ON SOME WALNUT VARIETIES

ISHS Acta Horticulturae 284: I International Symposium on Walnut Production

WINTER FROST DAMAGES ON SOME WALNUT VARIETIES

Authors:

V. Ughini, R. Valli

Abstract:
The frosts of January 1985 (the absolute minimum temperature was -20°C) gave the opportunity to make observations about the damages occurred to walnut trees grown in a variety collection in Reggio Emilia.

For each cultivar the following parameters were taken into consideration:

damaged tree percentage;
trunk crack number and size;
cicatrization degree during the years following the winter frosts.

The results pointed out an evident susceptibility among the varieties. In particular the Californian varieties showed to have a lesser hardiness However this susceptibility does not compromise their survival.

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