TO THE ISSUE OF IMPROVING THE METHODOLOGY OF INVESTIGATION ON THE INFLUENCE OF THE WHITE MISTLETOE (VISCUM ALBUM L.) ON DURABILITY OF TREE BRANCHES (FOLLOWING AN EXAMPLE OF THE COTTONWOOD TREE, POPULUS DELTOIDES MOENCH.)
Abstract
In Ukraine the White Mistletoe (Viscum album L.) is one of the most significant biotic factors that affect tree stands. The plant is known to cause deterioration of tree health (i.e. trees infested by the White Mistletoe show increased defoliation and dieback, reduced growth and productivity) as well as aesthetic appearance. We aimed at investigating the influence of the White Mistletoe’s (Viscum album L.) dwarves on the tree branch durability, following an example of the Cottonwood Tree (Populus deltoides Moench.), as one of the commonest urban tree species in the city of Kharkiv. Field samples comprising two sets of randomly cut poplar branches – 20 pieces of those infested by the mistletoe and 20 pieces of those without the mistletoe dwarves were collected from an industrial area in the southeast of the city of Kharkiv, Ukraine. Mass of the mistletoe dwarves was measured in the field, while branch characteristic diameters, branch weight and wood density were measured in the laboratory. To test branch durability measured as the break threshold pressure, Р, the laboratory hydraulic press PLG-5 was used. Our results have shown that the White Mistletoe’s infestation affected the strength of the wood by 37 %. Further investigations are proposed to assess the wood durability of hardwood trees under infestation by the White Mistletoe.
Keywords: tree stands, tree branches, durability, the White Mistletoe, the Cottonwood.
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