![]() ![]() Ink Spot: Is a fungal disease of Iris reticulata bulbs.As the disease progresses whole leaves can die back. The flecks enlarge and are filled with rust coloured fungal spores that have a powdery texture that can stain hands and clothing when touched. These flecks can appear on either side of the leaf surfaces. Damage is characterized by small rust coloured flecks that are often surrounded by a yellow boarder. Rust: is also a fungal disease caused by the fungal species Puccinia iridis.Other diseases and factors that can cause spotting on iris leaves: Stems and flowers can also be affected.įungal leaf spot on Iris leaves. As the disease progresses the spots coalesce, and entire leaves can die. The fungi continue to reproduce non-sexually throughout the summer during periods of high moisture and humidity. As the spots enlarge the centers turn brown and dry and may be surrounded by a reddish border. Following this primary infection, small, either circular or oval yellow spots with water-soaked margins appear. ![]() to new growth, where it enters the plant either through stomata or by penetrating the epidermis within hours of contact. The fungal spores are spread mostly by splashing water but also by insects, wind, human activity etc. When the milder temperatures of spring arrive the overwintering fungi Mycosphaerella macrospora (the sexual stage of the fungi that were produced in the autumn to survive the winter in plant debris) begin producing masses of non-sexual spores (conidia) and to a lesser extent sexual spores (ascospores) during periods of high moisture and or humidity (University of Illinois, (1982)). Identification and Life Cycle of the Fungus “Other hosts of the leaf spot fungus include daylily (Hemerocallis), freesia, gladiolus, and narcissus” (University of Illinois, (1982)). This is a common and widely spread disease of iris, especially rhizomatous species, most notably bearded iris (although both bulbous and rhizomatous are affected). gracile), the non-sexual stage of the fungus, (referred to as, imperfect state). Davidiella macrospora), the sexual stage of the fungus, and Cladosporium iridis (syn., Heterosporium iridis, H. Iris Fungal Leaf Spot Disease (also known as leaf blotch of iris) is caused from the fungus Mycosphaerella macrospora (syn. ![]() Leaf spot diseases greatly mare the appearance of Iris plants and can kill whole leaves and eventually plants if not brought under control. Of these factors fungal leaf spot is the most common and widely spread. There are several potential causes of leaf spots on Iris including fungal infection, bacterial infection, various viruses, insect damage and various environmental factors. ![]()
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