Extension > Garden > Diagnose a problem > What's wrong with my plant? > Deciduous > Hawthorn > Discolored or cracked area of bark
Hawthorn > Trunk/branches > Discolored or cracked area of bark
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Fire blight
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 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
- More information on fire blight
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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
