[bendipa]

The older, lower ones seem to have got mottling or in some cases have gone brown and died. Is this normal, or is that a symptom of virus?



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[Trillium]

Looks like you have a bit of flea beetle damage too. Mostly, by this time of year, older leaves are starting to die down, especially if it's been dry. Canes that fruited this year will definitely start to die down slowly right to the top.

I wouldn't worry too much about it.