ULMUS L. VARIABILITY STUDY

Nikolay Stoyanov

Abstract


In the twentieth century, massive drying of the elms appeared in Europe, provoked by the spruce Ophyostoma ulmi (Buisman), Nannfeldt., introduced by Southeast Asia, which was discovered and described in Bulgaria in 1932. The epiphytotic development of phytopathogen since the 1970s threatens to extinct European elm species. The present study aims to examine the existing plantations and single groups of elms in Northern Bulgaria, the diversity of them in terms of a number of tax and morphological indicators, as well as the growth of saplings from selected elbows in experimental cultures. As a result of the studies, several forms of cracking, size and shape of the crown, as well as differences in the size and color of the leaflets, have been identified. Recommendations have been made for the opportunity of using the elm to restore the wet forest ecosystems along the Danube and the internal rivers.

Keywords


stem shapes, crown diversity, elm, leaf pettura, rhythodom

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References


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