and that was my conclusion to club root, and how old wives tales begin.
Club root, what is it,
Clubroot is a common disease of cabbages, radishes, turnips and other plants belonging to the family Cruciferae (mustard family). It is caused by Plasmodiophora brassicae, which was once considered a slime mold but is now put in the group Phytomyxea. It has as many as nine races. Gall formation or distortion takes place on latent roots and gives the shape of a club or spindle. In the cabbage such attacks on the roots cause undeveloped heads or a failure to head at all, followed often by decline in vigor or by death. It is an important disease, affecting an estimated 10% of the total cultured area worldwide.
and from that my theory could have been right about the pea, but then I read this
Do not accept soil from another plot unless it is certified club root disease free
And read books properly like, leather jackets eat the roots of succulent plants,
The cause of the pea club root was because farm produce should be rotated , do not grow the same produce in the same plot year after year ,