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Extension > Garden > Diagnose a problem > What's wrong with my plant? > Deciduous Trees > Ash > Leaves partially or completely brown

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Ash > Leaves > Leaves partially or completely brown

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  • Image: Anthracnose 1
  • Image: Anthracnose 2
  • Image: Anthracnose 3

Discula fraxinea

  • Tan to brown irregular spots on leaves, often causing leaves to be curled or deformed
  • In severe infection leaves may wilt and fall off, part or all of the tree may lose its leaves
  • Common on young leaves in cool wet spring weather
  • Lower leaves and leaves in the inner canopy are often infected first, or most severely
  • More information on Anthracnose
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  • Image: Ash plant bugs 1
  • Image: Ash plant bugs 2
  • Image: Ash plant bugs 3

Ash plant bugs

  • Damage occurs during spring but will be present remainder of summer
  • Feeding cause speckled, pinprick whitish or yellowish discoloration; does not cause leaf drop
  • Severe feeding can result in brown, dead areas, especially along edges of leaflets
  • Nymphs bright red, then turn yellowish or brownish
  • Adults brown and yellow with heart-shaped mark
  • More information on Ash plant bugs
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  • Image: Stem girdling roots, trunk base 1
  • Image: Stem girdling roots, trunk base 2
  • Image:Stem girdling roots, tree

Stem girdling roots

  • 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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  • Image: Environmental stress, tree top - no leaves
  • Image: Environmental stress, brown leaves
  • Image: Environmental stress, missing leaves

Environmental stress
Drought, compact soils, flood damage, winter injury, other

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  • Image: Verticillium, dead leaf patches
  • Image: Verticillium, dead tree crown
  • Image: Verticillium, twig up close

Verticillium wilt
Verticillium dahliae

  • 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 wilt

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