Purple peas are a member of the group commonly known as southern peas. There are altogether maybe a dozen or two different varieties and cultivars, and they come in a number of different color variations. There are no diseases that I can find that cause pea pods to turn yellow, yet don't affect the leaves. I think that, despite the label, your peas are not "purpling," and you're missing the harvest, so that the yellow is the color they turn as they start to dry. Go ahead and try some when they're nice and green and fat, and see how they taste.
Answered on August 26, 2014
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