Skip to Left navigation Skip to Main content Skip to Footer

University of Minnesota Extension

Extension > Garden > Diagnose a problem > What's wrong with my plant? > Deciduous > Buckeye > Spots or blotches on leaves

Print Icon Email Icon Share Icon

Buckeye > Leaves > Spots or blotches on leaves

1 of 5
  • Image: Winter Injury 1
  • Image: Winter Injury 2
  • Image: 3

Leaf blotch
Guignardia aesculi

  • Irregularly-shaped, reddish brown blotches with yellow border on leaves
  • Leaves curl and become deformed around leaf spots
  • Reddish-brown spots may be visible on leaf petioles and immature fruit
  • Leaves may drop prematurely if infection is severe
  • More information on Leaf blotch
2 of 5
  • Image: Black Rot 1
  • Image: Black Rot 2
  • Image: Black Rot 3

Glomerella cingulata

  • Leaf veins, mid rib and petioles turn brown
  • Round to irregular brown spots develop near leaf veins
  • Most severe on trees stressed by heat, drought, nutrient deficiency or other conditions
  • More information on Anthracnose
3 of 5
  • Image: Fire Blight 1
  • Image: Fire Blight 2
  • Image: Fire Blight 3

Leaf scorch

  • Leaf margins turn reddish brown and may curl
  • More noticeable in last half of summer
  • Most common on leaves exposed to sun and wind than sheltered leaves
  • Severely affected leaves drop prematurely
  • More information on Leaf scorch
4 of 5
  • Image: White Rot 1
  • Image: White Rot 2
  • Image: White Rot 3

Powdery mildew
Phyllactinia gutttata

  • White-gray, felt-like spots or patches on leaves
  • Infected leaves may curl, twist or fold upwards
  • Infected blossoms are distorted, discolored and covered in white powdery fungal growth
  • Lower shaded leaves and small understory trees are most commonly affected
  • More information on Powdery mildew
5 of 5
  • Image: Drought Stress
  • Image: 2
  • Image: 3

Japanese beetle
Popillia japonica

  • Skeletonizes leaves, i.e. chews leaf tissue between the veins creating a lacelike appearance
  • Damaged areas turn brown
  • Attacks are common in sunny locations starting at the top of the tree and working down as they feed
  • Adults are a metallic green; bronze wings; 5 white tufts of "hair" along their sides and two white tufts on the tip of the abdomen
  • More information on Japanese beetle

Don't see what you're looking for?