re: How many of you use plant with seeds from vegetables from last crop?

Not sure if anyone mentioned it or not but hybrids for thr most part usually have good disease resistance to Serrano diseases. An “heirloom” are the ones you can keep the seeds. They’re typically reliable year to year but may have issues with certain diseases. I have retained tomato seeds before, take it and smear the seeds on a paper towel and let it dry, then when the seeds dry collect them and save them, put em in the freezer until next spring