Blackfly are regular visitors to our allotment and they tend to love the leaves of broad bean plants, causing infestation around the tips of the shoots.
If left unabated they can restrict plant growth and harvesting quite severely. To control blackfly try nipping out the broad bean shoot tips as soon as you notice any blackfly. You can also spray with soapy water.
You may also notice small u-shaped notches being eaten out of your broad beans leaf edges during May and June. These are caused by pea and bean weevils which emerge from the soil in early summer.
They are fairly harmless however, and the plants usually continue to grow without any problems.