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Possible Reasons for Mature Tree Death

Tree

I live in an older neighborhood where the trees are mature. In the past few years, many of the trees died for no apparent reason - maples, dogwoods and ash. Limbs die here and there and before you know it, the tree is dead. What could be happening?

Several things could be happening with the trees. Often times, the tree's owner notices sudden wilting, leaf drop, or branch dieback and is concerned that the tree is being attacked by a specific disease or insect, though none can be found. However, twig growth may indicate that the trees have not been growing well for a number of years. To determine growth per season, look for the bud scale scars on the twigs; this appears as faint rings encircling the twig. This is where new buds opened each spring and produced the season's growth. In general, for the trees in your list, growth should range from 6" per year up to 12" or more, depending on species (and sometimes cultivar).

Trees in decline can do so for a number of years. With unusual weather over a period of years, and hot and dry weather in the current season, trees may exhibit more distinctive symptoms that alert the owner that there is a problem. Girdling roots, soil compaction and poor drainage, construction and other mechanical injuries, restricted rooting zones, non-degrading burlap on rootballs, or wire/twine left at the base of trunks can all cause decline over time.

Ongoing good tree health management is important, including proper planting and establishment, timely fertilization, pruning, mulching, and irrigation. When a problem is noted, such as a girdling root or injury to the bark, take care of it in a timely manner.

Source: OSU Plant Facts