Peanut Late Leaf Spot is caused by Cercosporidium personatum. Late leaf spot has become more common recently and has been the most important leaf spot the past few growing seasons. Late leaf spot causes dark brown to black spots that may or may not have halos. Late leaf spots produce dark brown spores, usually on the underside of the leaf. The mass of spores can be seen without magnification and give the spot a velvety appearance. It is important to determine if late leaf spot is present since it can be more difficult to control.