Well, our tomato trials are about to begin. I have seeds for two of the varieties we are hoping will show resistance, and the rest have been ordered.
If you haven't been reading, scroll back a few posts for information on this awful tomato disease, and a link to photos of the nasty things it does to a tomato plant (See post "Have you seen this tomato disease?). Tomato late blight is the disease that caused the Irish potato blight, and a new strain of it has been destroying tomatoes in the Bay Area for the past 10 or 15 years. Some recent scouting around on the web that I did turned up reports that a few tomatoes might resist it, so we plan tto grow a bunch of them at City College of San Francisco this spring and try them out. We will have some extra, which will be available in the plant sale, which is traditionally the Thursday before Mother's day, in the day time. If you are interested in participating in the trial, you can come and purchase a few, or, you can just grow your own and send in some results at the end of the summer.
We will be growing: 'Legend' (medium-sized fruit, bred for resistance, but may not resist the strain we have, from Territorial Seed Co.), 'Koralik' (cherry-sized, from Territorial Seed Co.) 'Tommy Toe' (cherry tomato, from Totally Tomatoes), 'Juliet' (grape-shaped tomato, from Totally Tomatoes), 'Matt's Wild Cherry', from Seeds of Change), red currant (wild variety, tiny fruit, from Totally Tomatoes, I think, but available several places).
Only 'Legend' was bred intentionally for resistance, the other choices are just based on informal reports.
If you plan to do this, you have to grow a control too, just to be sure you actually have the disease. (The spores fly in the wind to land on your plants, rather than being in the soil.) So grow one or more of the possibly resistant varieties, and also grow one that would get it if the spores landed on it--most any other kind will do. I have used 'Celebrity', a short plant that is resistant to just about any other tomato disease, but gets late blight. Or you could just grow some 'Early Girl' or 'Stupice', both tall plants with medium small fruit, and good production and flavor.
Let me know if you are planning to run a trial. We need a few going in different places to see if results agree.