What Type of Fungus Grows on Iris Plants?

Mycosphaerella macrospora, formerly known as Didymellina macrospora, is the leading fungus on iris plants. This fungus causes leaf spots, which look like small brown spots with a yellowish halo on the top portion of the leaves. The fungus starts out slow, but as temperature increases so do the number of spots. Use a fungicide that names this specific fungus to ensure plant health.

Keywords: iris plant health, iris bulbs, leaf spot

About this Author

Living in Southern California, Shayne Ochoa has been writing professionally since 2005. Her articles have included topics on education, child development and gardening. She also holds a Bachelor of Arts degree in liberal studies from California Baptist University in Riverside.