I'm sure it's some sort of deficiency in the soil.
I garden on clay soil and we have had a heck of a lot of rain recently!!!
The leaves have gone a very pale green , with the veins dark green. apart from that the plants look healthy.
Any suggestions?
The Asparagus plants I planted this year, threw up a few small fronds, but now they are dying back. Is it the right time for that to happen or have they succumbed to water logging?
Have a look at this link and see if you can identify your French Bean symptoms.
http://www.hortnet.co.nz/publications/guides/fertmanual/vege2.htm#I1