I. Scapin, P. Romisondo, G. Mozzone, F. Spanna, P. Bertone
In 1990 and 1991 springs a spread disorder, seriously compromised the regular development and yield ability of hazelnut.

The symptoms, also observed in previous years were a lack of sprouting in the medium-high part of the branches and a marked dehidration of the wood but without necrosis or tissue darkening.

Also latent buds didn't sprout and the catkins resulted completely dryed. During the vegetative period the affected plants suckered abundantly.

Field researches and laboratory analysis were conducted to discover the cause and the geographycal distribution of the disorder.

The results showed that the affected hazelnuts were situated in non-irrigated different pedoclimatic situations on the hilly areas of the Alta Langa (Cuneo province) and that the disorder principally affected, wild and cultivated 4–10 years old plants, belonging to different varieties.

Laboratory analysis didn't identify any biotic agent as a cause of disease.

For this reason an investigation on meteorological data of the last 4 years was performed relating them with thermopluviometric hazelnut requirement in different phenological stages.

Results showed that the problem was due to a physiological disorder whose cause is the climatic course particularly unfavourable for hazelnut cultivation in the considered years.

Scapin, I., Romisondo, P., Mozzone, G., Spanna, F. and Bertone, P. (1994). INDAGINE SUL DISSECCAMENTO PRIMAVERILE DEL NOCCIOLO. Acta Hortic. 351, 591-600
DOI: 10.17660/ActaHortic.1994.351.65

Acta Horticulturae