Runner Bean Problem
 

I have a bumper crop of runner beans this year however the leaves are
infected with small circular fungi type growths on the underside. The
variety is enorma, Can anyone help?

I have uploaded a picture for you to see @

http://www.palo.co.uk/runnerbean.jpg and a close up @
http://www.palo.co.uk/runnerbean1.jpg

Kind Reagrds

Paul