Saving seed from diseased plants

[TZ-OH6]

Which diseases do you have to be worried about when saving seeds? I have a single plant of a variety that got wiped out by some sort of wilt disease and I'm trying to decide if I should save seeds from the fruit that will ripen soon (and bleach dip the seeds), or just toss it all.

[dice]

Most of the "seed-borne disease" documentation fails to
distinguish whether the disease is on the outside of the
seed (in which case fermentation may kill it, TSP may
separate it from the seed, and chlorine bleach should kill
it either way) or if it infects the germplasm inside the seed
coat (in which case you would need some kind of heat or
chemical treatment that would penetrate the seed coat
and kill the pathogen without killing the seed).

Some virii (Pepino), bacterial, and fungal diseases are reported
to be seed-borne, but I still do not know if a bleach soak will
necessarily kill them. (Are they on the seed or in the seed?)

[habitat_gardener]

I'd save the seed and continue to research the question.

One data point: Last year's Black Cherry produced only a handful of fruit, and it got browned hard stems. The whole plant was only a foot or two high. I saved seeds anyway. This year's plant, from that seed, is the healthiest looking one in my garden, loaded with fruit. (The flavor is not up to par, but I think I've been overwatering, and it's still early in the season.)

[dice]

If disinfecting them with bleach, saving them, and growing them
yourself, the only risk of a seed-borne disease surviving the
bleach process is your own. Trading seeds from diseased
plants, even if disinfected with bleach, however, is gambling
with someone else's garden. That should be deprecated.