Invasive Species Compendium

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Abstract

Burst phenology and birch bud resistance to frost.

Abstract

The burst phenology of birch (Betula pendula) in Měděnee, Czech Republic, depending on the sum of effective temperatures (SET), and effects of low temperatures on buds after a typical warming and subsequent frosts (-1.9 to -10.4°C) during winter (9 February-4 March 1998), were investigated. Results of the investigations showed no bud growth during 31 January and 27 February 1998 at SET of 23.1°C. The birch responded by growth in buds at the SET of 31°C, subsequent cooling with the minimum temperature of -10°C stopped the bud growth but did not damage the buds. It is suggested that if birch is not exposed to other stress factors disturbing the bud physiology, it is resistant to unusual temperature fluctuations during winter and to late frosts.