I would go easy on the sterilization. Giving seeds a bleach rinse is a laboratory technique that helps scientists cut down on the number of variables in an experiment. If seeds coming from different sources have different types of fungal spores on them, they may give widely varying results when the seeds germinate and start forming mycorrhizal associations with the different spores. A bleach rinse kills all the spores and then you have a nice, clean experiment.
But from your list, it sounds like you want to grow food in a garden, not study one plant under controlled conditions in a lab. So I would only do a bleach rinse on the seeds that you suspect might be contaminated with something like Fusarium. Even then, if there is Fusarium in the soil, your seedlings could still get infected. I've battled Fusarium on and off, and the thing that works best for me it to grow mustard as a green manure and plow it under. I can't be bleaching large areas of my garden.
Miles Flansburg wrote:Hum, I have never heard of this. Teach on !
OK, here's a reference (with a whole mess of other references therein) that goes into more detail than my flip comment. If you are going to do any of these, don't go and plant the seeds you have pretreated out into your already infected garden. Start them in sterilized soil in a greenhouse where you have more control. When the seedlings get 4"-8" tall, at a good transplant size, then you can plant them out into the garden. And at transplant time you can use a fungal or bacterial compost tea to overwhelm any nasties that might be lurking in the soil.