moldy crud on sepals

[bower]

Oh no... having a pretty nice sunny day today and then I found this crud on sepals of small fruit, two plants one cluster each affected... It looks to me like grey mold or similar getting started on the place where aphids had been feeding.
I was going to ask advice first but then I panicked, being a very windy day as well with all vents open and quite a gale blowing through the greenhouse, so I dabbed the surface with a little peroxide and then pre-emptively removed fruit and or affected sepals.

What would you do?