Allotments 4 All

Some of my courgettes are covered in blackfly. Mostly on the flowers. The plants look healthy enough. But will they do any damage? I haven't seen many ladybirds this year.

We seem to have loads of blackfly. Is it a bad year for them?

our squash flowers are covered in pollen beetles, sure they're blackfly, they usually go for the new shoots on stuff, I think  :)
this was taken yesterday