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Extension > Garden > Diagnose a problem > What's wrong with my plant? > Deciduous > Serviceberry > Discolored or cracked area bark

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Serviceberry >Trunk/branches > Discolored or cracked area bark

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  • Image: Apple Scab 1
  • Image: Apple Scab 2
  • Image: Apple Scab 3

Fire blight
Erwinia amylovora

  • Infected leaves wilt, turn gray then dark brown to black
  • Young shoots wilt into a shepherd's crook
  • Infected blossoms first turn gray, then black
  • Infected leaves and mummified fruit remain attached to the tree, often into winter
  • Branch cankers have dark, sunken and cracked bark, sapwood is streaked reddish brown
  • Drops of sticky honey-colored liquid can be seen on infected plant parts in warm wet weather
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  • More information on fire blight
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  • Image: Apple Maggot 1
  • Image: Apple Maggot 2

Roundheaded appletree borer
Saperda candida

  • Dead stems and stem breakage
  • Cracks or splits in bark on lower stems
  • Areas of darkened bark and sap oozing from entrance hole
  • Larvae have round bodies, tan to cream colored, legless, about 1 – 1 ½" long
  • Adult brown with two white stripes, about ¾" long with equally long antennae
  • More information on Roundheaded appletree borer
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  • Image: Plum Curculio 1
  • Image: Plum Curculio 2
  • Image: Plum Curculio 3

Blister canker
Biscogniauxia marginata

  • Dead branches in the canopy
  • Elongate, darkened canker on trunk or branch often centered on a crack or wound
  • Reddish brown discoloration of sapwood extending up and down from crack or wound
  • Round flat gray to black fungal spore producing structures up to ¼ inch across, push through bark on infected branches
  • Bark often peels back in rolls on infected branches
  • Most common on drought stressed, wounded trees
  • More information on Blister canker

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