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2022, № 6 (54) |
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ECOLOGY
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Trofimov V.N., Trofimova O.V. |
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Signs of damage to Pennsylvania ash Fraxinus pennsylvanica Marsh. by narrow-bodied golden Agrilus planipennis Fairmaire (Coleoptera, Buprestidae) when assessing the viability of trees |
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The research carried out in three types of urban plantings of Pennsylvania ash in the northeast of Moscow. The surviving trees damaged by Agrilus planipennis in 2005-2012 studied. Half of the damaged trees show the ability of partial overgrowing of the dry side on around the old larval gallery. The size of the cambium roller around the dry side indicates the viability of the tree. Trees with single longitudinal bark cracks on larval gallery retain viability for more than 10 years. Trees with cracks and dry sides covering up to 1/3 of the trunk circumference live for at least seven years (9.37+2.32). Trees with cracks and dry sides from 1/3 to 2/3 of the trunk circumference and partial bark fall live for at least five years (6.73 + 1.21). Trees with cracks and the absence of more than 2/3 of the bark along the circumference of the trunk of the categories "severely weakened" die within 1-2 years. The first appearance of shoots in the butt part of the trunk of seeming healthy trees is a sign the attack of larval gallery 2 years ago.
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