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Extension > Garden > Diagnose a problem > What's wrong with my plant? > Deciduous > Hawthorn > Dead twigs or branches

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Hawthorn > Trunk/branches > Dead twigs or branches

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  • Image: Eastern Tent Caterpillar 1
  • Image: Eastern Tent Caterpillar 2
  • Image: Eastern Tent Caterpillar 3

Quince rust
Gymnosporangium clavipes

  • Fruit and stems may be swollen or distorted
  • Some yellow to orange leaf spots may be present
  • Tubular, white fungal spore producing structures protrude from fruit, giving it a spiky appearance; become orange when spores are released
  • Bright orange powdery spores may be seen on and around infected leaves and fruit
  • More information on Quince rust...
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  • Image: Fall Webworm 1
  • Image: Fall Webworm 2
  • Image: Fall Webworm 3

Fireblight
Erwinia amylovora

  • Infected leaves wilt, turn gray then dark brown to black
  • Young shoots curl over 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 & cracked bark, sapwood is streaked reddish brown
  • Drops of sticky honey-colored liquid can be seen on infected plant parts in warm wet weather
  • More information on Fireblight…
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  • Image: Eastern Tent Caterpillar 1
  • Image: Eastern Tent Caterpillar 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 tan to cream colored and grub-like, 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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