I'm hoping that this is not hvx but I suspect that this plant is toast. Please let me know what you think thanks Frogged.
Looks like frost damage to me.
There are others on here with more expertise than me but I would say that looks like frost damage.
I think it's weather related too.
No virus here. Move along.
frost/cold damage ... maybe even sunburn ...
is that a fragrant plantaginea version???
they are very susceptible to such in MI
i bet the fold of the leaf.. points due south.. or toward sun???? if so.. sun.. if not.. cold...
this is the second post in 2 days.. virus does NOT cause browning tissue ...