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Extension > Garden > Diagnose a problem > What's wrong with my plant? > Deciduous > Buckeye > Leaves small and discolored yellow to brown

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Buckeye > Leaves > Leaves small and discolored yellow to brown

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  • Image: Fire Blight 1
  • Image: Fire Blight 2
  • Image: Fire Blight 3

Verticillium wilt
Verticillium dahliae and V. albo-atrum

  • Leaves are small and yellow 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 or a few random branches in the canopy
  • Dark olive to gray streaks are often visible in the sapwood if the bark is peeled back, appearing as rings or arcs in a cross section
  • Symptoms may develop over a single season, or over several years
  • More information on Verticillium wilt...
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  • Image: Black Rot 1
  • Image: Black Rot 2
  • Image: Black Rot 3

Ganoderma root and butt rot
Ganoderma applanatum

  • Leaves are small, turn yellow and drop prematurely
  • Canopy appears thin with few leaves and multiple dead branches
  • Fungal conks, semicircle shelf fungi, can be found from the base of the tree up to 3 feet high on the trunk
  • Conks are reddish brown and shiny on top, white and porous underneath, a rim of white may be visible on the edge of the growing conks
  • Infected wood at the base of the tree is white, soft, stringy or spongy
  • Infected trees frequently break or fall over in storms
  • More information on Ganoderma root and butt rot...
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  • Image: White Rot 1
  • Image: White Rot 2
  • Image: White Rot 3

Armillaria root rot
Armillaria spp.

  • Infected trees have poor growth, dead branches in the upper canopy, undersized and/or yellow leaves
  • Flat white sheets of fungal growth (mycelial fans) between the bark and sapwood at the base of infected trees
  • Thick black, shoestring-like fungus can sometimes be seen under the bark, around roots and in the soil around the base of the tree
  • Wood is decayed, white, soft and spongy; this may extend from the base of the tree well up into the trunk
  • Trees frequently break or fall over in storms
  • Clusters of honey-colored mushrooms may grow at the base of the tree in fall
  • More information on Armillaria root rot...
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  • Image: Winter Injury 1
  • Image: Winter Injury 2
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Oystershell scale
Lepidosaphes ulmi

  • Heavy infestations can completely cover bark
  • Feeding can cause foliage to yellow
  • Twig and branch dieback can occur when branches are heavily infested
  • Light to dark brown, elongated, 1/10 to 1/8 inch long, found feeding on branches
  • Damage occurs during summer
  • More information on Oystershell scale...
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  • Image: Sunscald 1
  • Image: Sunscald 2
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Heart rot
Polyporus squamosus and Oxyporus populinus

  • Fungal fruiting bodies arise along the stem, near a pruning wound, crack or other wound
  • Polyporus fungi are 12" or more across, yellow-tan above and grow atop a short dark stalk
  • Oxyporus shelf fungi are 6" across, almost as thick and often covered with green moss
  • The canopy may show no symptoms or may have small yellowing leaves or dead branches depending on the extent of the trunk decay
  • In cross section of the trunk, the wood at the center is discolored, soft, crumbling, stringy or spongy
  • More information on Heart rot...

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