2 Questions

Hello, can anyone identify the plant/growth on the attached image? It is quite prevalent in the areas around my allotment, but hasn't quite reached my plot yet.
Secondly, can anyone tell me why my pea plants have started to turn yellow? I planted them out a couple of weeks ago (they have gone through a couple of frosts), but they are planted in moist, very well fed/manured ground. It's only my second full season in my allotment and I am still very much learning as I go along!
Thanks in advance
Secondly, can anyone tell me why my pea plants have started to turn yellow? I planted them out a couple of weeks ago (they have gone through a couple of frosts), but they are planted in moist, very well fed/manured ground. It's only my second full season in my allotment and I am still very much learning as I go along!

Thanks in advance
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Posts
I have it on my plot and in GH, constant weeding does reduce it but dig down as far as you can when pulling out the roots, if they snap off to soon two will grow in place of one. If it's allowed to mature to a fir like plant, it's been left to long and will have sporned.
Good luck...