U of M Gardening Information: What's wrong with my plant?

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Dead branches in the canopy
Leaves wilt and turn brown at the tips and the margins first, then completely brown
Many weak young shoots/sprouts at the base of the tree
Leaves appear drooped or wilted within canopy
More information on Environmental stress...

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A root circling the trunk of the tree may be seen at the soil line
The trunk may become sunken in or compressed where it contacts the root
If the girdling root is below ground the trunk will lack the natural widening or flare at the soil line, but rather will go straight into the earth like a telephone pole
Affected trees have slow growth, poor color, change color and lose their leaves early in the fall
Affected trees commonly exhibit water-stress symptoms such as marginal leaf scorch, wilting, sudden leaf fall.
Affected trees commonly exhibit excessive and abnormal winter damage including true frost cracks and dieback
More information on Stem girdling roots...

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Leaves are small and yellowed in chronic infections
Leaves turn brown from the edges and tips, wilt and die in severe infections
Leaf symptoms are often seen on only one branch in the canopy
Tan to pale brown streaks often can be seen in the sapwood if the bark is peeled back, appearing as rings or arcs in a cross cut
Symptoms may develop over a single growing season, or over several years
More information on Verticillium...

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Infected plants grow very slowly, and have a sparse thin canopy of leaves
Leaves are small, yellow, often folded or cupped and grow in clumps along the branch
Branches die throughout the canopy
Many weak young sprouts with small yellow leaves arise from the base of the tree

Ash > Leaves > Leaves yellow and small