Pest
BlackflyBlack insects on broad bean tips

Clusters of small black aphids on the soft growing tips, usually from late spring.
When it shows up: Late spring and early summer
What to do
Pinch out the tips once the first pods form: it’s where blackfly start.
Rub small clusters off with your fingers, or spray with water.
Ladybirds and hoverflies eat them, so go easy on sprays.
Helps prevent it
Not quite it?
These look similar. Compare the photos.

