By Michael Nolan
Looks like: Darkened spots on the older leaves, with rings. The area around the spot will often turn yellow.
Treatment: The fungus that causes Early Blight can survive through the coldest of winter months in the soil. The only way to avoid Early Blight is to completely remove any affected plants and clean all of the garden debris in the area. Some experts say that copper or sulfur spray will stop the fungus from spreading.
Looks like: Late Blight is what caused the infamous Irish Potato famine. It presents as a gray spot on the leaves that looks almost like a grease spatter, and will often be surrounded by white mold – especially in wet weather.
Treatment: This fungus is Read the rest of this entry »