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Extension > Garden > Diagnose a problem > What's wrong with my plant? > Fruit > Apple > Yellowing leaves

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Apples > Leaves > Yellowing leaves

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  • Image: Iron Chlorosis

Iron Chlorosis

  • Newest leaves towards ends of branches are generally yellowed, while leaf veins remain green (interveinal chlorosis)
  • More common in western Minnesota
  • More information on Iron Chlorosis...
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  • Image: Honeycrisp Leaf Mottle Disorder 1
  • Image: Honeycrisp Leaf Mottle Disorder 2

Honeycrisp Leaf Mottle Disorder
(Honeycrisp Chlorosis)

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  • Image: Powdery Mildew 1
  • Image: Powdery Mildew 2
  • Image: Powdery Mildew 3

Powdery Mildew
Podosphaera leucotricha

  • Part or all of infected leaves are covered in white-gray, felt-like patches
  • Infected leaves will curl, twist, or fold upward
  • Infected blossoms are distorted, discolored, and covered in white powdery fungal growth
  • Infected fruit have bronze, corky streaks, that are skin deep
  • For more information on Powdery Mildew...
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  • Image: Dogwood Borer 1
  • Image: Dogwood Borer 2
  • Image: Dogwood Borer 3

Roundheaded Appletree Borer
Saperda candida

  • Foliage becomes sparse, pale colored, and eventually turns yellow
  • Reddish brown frass (sawdust and droppings) can be present on bark near base of tree
  • Branch dieback occurs as infestation becomes more severe
  • ¼ inch round holes present in trunk; Large tunnels found in sapwood
  • Adults are ¾ inch long, white and brown striped body with long antennae; active June to August
  • Larvae are up to 1+ inches long, cream colored, round and plump and legless; because life cycle takes two years or more, larvae are present in wood at any time of year
  • More information on Roundheaded Appletree Borer...

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