Something to think about. Most Blights can be seed borne. Might want to think about doing your own seed treatments. Blights can also be carried by insects. Weeds can also host blights. Might think about checking all the weeds in your lawn and around your garden for plant diseases. Remove and destroy to reduce sources of infections. I found early blight and Mildew on dandilions Also found early blight and phytophthora on golden rod. Your garden Your option Byron