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maybe powdery mildew. Why do you think it is fusarium?

I believe you may be right.

Your peas seem a little out-of-season there in zone 8. I wonder if that may be a contributing factor.

There are a good number of fusarium wilt resistant tomato varieties. There are even those claims made for some heirlooms. Before you despair, check your varieties.

digitSteve

I think it's way too hot now for peas in Zone 8 and they're dying as they normally would. They're cold- and cool-weather plants, as you know.

Here's information about fusarium wilt on peas from Penn State, and I doubt if your peas have it unless your soil had it to begin with or your seeds were not from a reputable dealer and were infected. But if that were the case, I think you'd see the infection pretty soon after they germinated, not later. Truly, I think your peas are just naturally giving up the ghost because of the heat. Fusarium Wilt and Near-Wilt are two major wilt diseases caused by different races of the fungus Fusarium oxysporum f. sp. pisi. Symptoms and controls for these two wilts differ, although they are caused by related fungi. Fungi that cause both diseases can be introduced with the seed. Once present, these fungi persist indefinitely in soil. Fusarium wilt often is detected by appearance of yellowing of lower leaves and stunting of plants. Leaflet margins curl downward and inward. The stem may be slightly swollen and brittle near the soil line. Internal woody stem tissue often is discolored, turning lemon brown to orange brown. Externally, the root system appears healthy; however, secondary root rots are likely to occur on plants wilted for long periods. Eventually, wilted plants may die.
Near-wilt symptoms are similar to Fusarium wilt symptoms. however, near-wilt plants die more slowly than do Fusarium wilt plants. Also, internal woody stem tissue usually is brick-red in near-wilt plants. This discoloration extends throughout the plant.

Thanks for the comments and advice. Although it seems late for peas in my zone, we've had a very wet and cold May/June. Today is the first sunny day in weeks. Highs have not been above 80 (except today). I don't think that it's dying off due to the heat.

My snow and snap peas seem to be doing okay. Finally harvesting snow peas and snaps are flowering now. Just wondering because it seems to have started near the bottom and progressing upward. I will monitor them and see what happens.

I'm with Anney - it looks like regular dying off of peas. Mine always die from the bottom up, and look exactly like yours do now once the weather gets warm (80 degrees to peas is SCORCHING) or once they've finished producing. They don't mind the wet and cold so much, in fact, I overwinter mine through frosts and wet winters, but depending on your highs, it sounds like it's still too hot for them.