Black Spot Plant Disease
image by iastate.edu
Black spot disease appears on plants' leaves as circular black patches with irregular edges. Members of the rose family are the most common victims. Eventually, the entire plant droops and sheds dead leaves.
This disease is caused most often by the fungus Diplocarpon rosae. The fungus survives through the winter in dead foliage and its spores are splashed onto healthy plants during spring rain storms, thus spreading the disease.
About this Author
Susan Kerr has been a professional writer since 1992. She is the former managing editor of "Pennsylvania Business Central" and "State College Magazine," and is now a contributor to several Faircount Media publications such as "The Year in Veterans Affairs and Military Medicine." Kerr holds a Bachelor of Science in organizational leadership from St. Francis University.