Answer: Sounds like your garden is a candidate for some of the disease-resistant pea varieties such as Maestro or Sugar Daddy. It would also help if you rotated your pea crops, planting them in a different bed each year. By continually planting in the same bed you run the risk of overwintering pathogens and insects attacking the peas as they emerge.
Captan is a fungicide, but it's not labeled for use on pea seeds prior to planting. As a matter of fact, the literature specifically states that it shouldn't be used on food crops.
Try sowing your seeds a week or two later than usual, to allow the soil to dry out a little more, and choose a disease resistant pea for next spring's crop.
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