WINTER FROST DAMAGES ON SOME WALNUT VARIETIES

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.

I International Symposium on Walnut Production

V. Ughini, R. Valli

https://doi.org/10.17660/ActaHortic.1990.284.37