It looks like I might not lose my remaining tomato plants. Last Saturday – 1 week ago today – I removed and burned all of the plants that showed severe symptoms. But most of the plants had some part that looked infected, and instead of destroying them I pruned out the bad parts. I have been spraying with Daconil, and a week ago I started also using Agrifos – a fungicide containing potassium salts of phosphorous acid. This is a material that can possibly be used by organic gardeners. I have used Agrifos experimentally, along with a material to enable it to penetrate the bark, on trees, and just learned it’s registered for food crops also. In the past week I have seen no spread of the late blight disease in my garden.
Oh, and by the way, I got my first ripe tomatoes this week. The earliest in the summer I can ever remember. They are on the Rutgers’ Mortons that are advertised to be an early ripener. I guess they are!