There is a product made by the Bayer company and sold as Natria. The active ingredient is a bacteria called Bacillus subtilis. It is supposed to "control or suppress" fungal infections and can be used in vegetable gardens. I am wondering if anyone here has experience with Natria and, if so, what do you think? The salesman at Lowe's, who used to run a greenhouse, says he has used it for 5 years and finds it to be very effective. He believes it prevented late blight in his garden last year. It is an organic way to prevent some of the fungal diseases we experience in our tomato gardens. What say you? There is nothing about this agent in the Disease Forum.