We have an otherwise apparently healthy euonymus in our garden, but a couple of branches have gone very pale, wide and flat with tightly bunched stunted leaves on the end. What causes this and is it anything to worry about?
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This is something called fasciation, caused by abnormal growth activity - as to what triggers that, there are 4 possible causes:- bacterial infection, viral infection, random genetic mutation, or injury through cold, mechanical damage or other damage. Those brown things might be adult scale - check the backs of other leaves, looking for white flecks - a heavy infestation of euonymus scale might have triggered the fasciation effect. If you find any, June is a good time to spray - Westland Resolva Bug Killer, or a systemic insecticide such as Provado Ultimate Bug Killer (more effective) should do the trick.
The fasciation may recur if its a result of viral activity, but usually, its an occasional event.