Extension > Garden > Diagnose a problem > What's wrong with my plant? > Deciduous Trees > Prunus > Rough, bumpy patches on branches
Prunus > Trunk/Branches > Rough, bumpy patches on branches
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Scurfy scale
Chionaspis furfura
- Infested twigs and branches show dieback in canopy
- Adults are white and covered by a white cocoon-like armor, which gives the appearance of white bumps along the stem or branches
- Crawlers or juvenile scales are light purple
- Cocoon-like armor can be seen year round but crawlers can be seen in June
- More information on scale insects
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Black knot
Apiosporina morbosa
- Lumpy olive to black elongate swellings along all sizes of twigs
and branches - Gall formation may cause leaves to wilt or not leaf out showing branch dieback
- Rough black cracked swelling can occur on the main trunk
- Most common on choke and pin cherry
- More information on Black knot
