Disease carried on seeds?

Hi Folks,
I'm new to this forum and new-ish to seed saving (having just saved my own tomatoes for years, now trying new things and wanting to do LOTS more seed saving!).
I'm moving growing sites over winter and we have a few disease issues on our current site.
I'm curious whether the diseases might be carried on seeds I save and what the advice would be around this please?
Two current specific concerns:
Tomatoes (blight and botrytis)
French beans (Sclerotinia)
Would love to be able to save seed without worrying about transferring to a new site,or perhaps its better not to and to start afresh?
Thanks in advance.
Jen

I believe that for every "bad" microbe that you take with you on your seeds, that you carry hundreds of beneficials. For example, a university found nitrogen fixing bacteria living in the root and leaf hairs of my tomatoes. I would have to leave those beauties behind by throwing the seeds away.

Did you save the seeds from healthy looking plants or from plants that were diseased?  I would only save seeds from healthy plants.

How could a seed from a healthy plant has a disease?  I guess it is possible ... anything is possible.

Thanks Joseph that's very helpful.

Anne, the diseases are fungal and therefore around in the air, so that was my concern, even if I can't see physical symptoms that the spores might be present on seeds.

Jen Howarth Uk wrote:, even if I can't see physical symptoms that the spores might be present on seeds.

Maybe washing the seeds would solve this problem.

Washing in plain water might be all that is needed though you can wash the seeds in hydrogen peroxide.

Our daughter has had good results soaking seeds in hydrogen peroxide when they are hard to germinate.

As far as I know, the primary danger of disease spread in plants is not actually disease...diseases are fungal, not bacterial or virus.

Most diseases I know of that are spread by plant parts are either on the surface of seeds or are on actual plant parts...leaves, stems, etc.  The "diseases" that are spread by seed are less likely to be fungus and more likely to be virus.

If you are not crossing international borders, I'd not be too concerned.  If there are no quarantine zones where you are or are moving to, specifically for what you mention, either the plants or the diseases, I'd not be too concerned.

There's a relatively simple hot water treatment for seeds (122 degrees for 25 minutes) to "clean" the seed of anything that might be catching a ride on the surface...seeds are plant parts, and while very few diseases are actually in the seed itself, they may well try to catch a ride on the surface of the seed coat or shell.