Hi, I'm a newbie to this growing lark, I've recently
taken a allotment and having a go for the first time this
year.
Been burying seeds and stuff and most seems to be growing,
however, looking at my broad beans today, they are
covered in black fly.
Will these pests do any harm to the plants?, if so
what is the best way to get rid of them??

Sorry if this sounds a silly question to the more experienced
of you but really I am a first timer and have a lot to learn.

Wally