AbstractThe height increment pattern of healthy and diseased Norway spruce over the period 1961–75 was studied to test the association of some climatic factors with height increment reduction and eventually foliar browning. Air temperature during December‐March inclusive, high velocity wind (22‐34 knots) duration during December‐March incl. and rainfall during May‐August incl. over the same period 1961–75 were examined. It was shown that the last outbreak of “top‐dying” in Scotland started in 1971. A correlation analysis and a stepwise multiple regression analysis were conducted to find possible relationships between annual height increments and climate. Results suggested that the coincidence of extreme values of the three considered climatic factors during the period 1971–75 may be responsible for the sharp decline of height increments in 1971 and severe outb
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