PlantWash is made by Soil Mender. (SoilMender.com.) It was origionally made for the U.S. Navy but it was accidentally found to be a great help for plants that had been infected with all sorts of things. It has only been available for about 4-5 years. It's totally organic. I have never heard of Blue Corn Meal, but as long as it is not enriched cornmeal I guess it would be OK. The cornmeal you want you can find as horticultural corn meal at a feed store or as whole ground cornmeal at your local HEB. As far as mixing everything together I don't see anything wrong, as none of the products will harm anything by themselves, but you have to strain the cornmeal or it will plug up your sprayer. Early Blight is a soil born fungus that only affects the sourthern US and as far as I know has never been seen in Europe or farther north than the soil freeze line. One of the best ways to slow down EB is to mulch your tomato plants to stop the soil from splashing onto your plants during a heavy rain. Most of the time EB kills the tomato plant AFTER the plant has set all of the fruit it will, especially determinate bush type plants. If you are growing indeterminate plants of large variety tomatos it will be too hot here for them to set a lot of fruit anyway. EB doesn't seem to affect the cherry varieties near as much as the larger types. I have never seen a cure for EB. It is something that you have to learn to reduce until your plants make their crop. That is why large indeterminate varieties of tomatoes like Brandywine, Beefsteak etc are not really sucessfull here. You can of course grow them but your crop will be severely limited.
