II deperimento delle querce: Sintomatologia ed influsso sul paesaggio agrario

Abstract

The oak decline is a syndrome very complex. In Europe and North-America this phenomenon became clear in early ′80. The most common symptoms are remarkable reduction of crown vitality, anomalous fall of branchelets and leaves, longitudinal lacerations of bark with exudation of a brownish mucilaginuos sibstance, production of epicormic shoots.Since that time several investigations have been carried out to get insight the development, the symptoms, the causes and remedy possibilities. Climatic stess (repeated droughts and exceptional frost periods), defoliator insects, root and bark fungi appear to play a significant role in the oak decline.However the phenomenon remain, until now, a “complex of complex diseases”.

Key Words:

• deperimento
• Quercus
• stress