RESUME
On the Causes of Excessive European Black Pine Dieback
Jaroslav Urban (pp. 502-503)
European black pine (Pinus nigra Arn.) belongs among one of the introduced species most often grown in forest and park cultures. Sudden worsening of their health, namely in young and medium aged plantings cultivated for decorative purposes, has been observed at many localities in the year 2000. The causes of decay and withering were investigated at 5 sites in Brno (230 m above sea level), Bystřička in Vsetín region (450 m a.s.l), and Deštné in Orlické Mts. (600 m a.s.l.). The primary cause of threat to plantings was an acute deficit in precipitation (a short-term drought) at the beginning of the vegetation season supported by high temperatures and drying winds.