I did a mound drench with GJP yesterday and today I go out and find these two spots of something on my garden the bigger of the two are on my potato mounds, any help would be great it doesnt look pretty at all.

Your mystery growth is slim mold. It is a fungus that grows on organic matter and is not a problem unless is surrounds young tender plants. It can be killed with baking soda spray, potassium bicarbonate spray, cornmeal juice or Plant Wash.