IrisLeafSpot. Publication 450-600. Mary Ann Hansen, Extension Plant Pathologist, Department of Plant Pathology, Physiology and Weed Science, Virginia Tech. LeafSpot On Bearded Iris. IrisLeaves Turning Yellow.Green Leaf With Yellow Spots. How To Treat LeafSpots. LeafSpot Symptoms. Plant Disease Identification. Brown Spots In Iris. This is particularly important where irisleafspot is a problem. Picking off leaves lightly infected with leafspot or rust can help to slow the spread of these diseases... A widespread, serious disease of iris is a leafspot caused by the fungus Didymellina macrospora. This disease occurs on leaves of several species of iris (including the bulbous types)... IrisLeaf Disease. One of the most common diseases affecting irises is fungal leafspot. Irisleaves develop small brown spots. These spots can enlarge quite quickly... iris. Look for small (1/8 to 1/4 inches in diameter) spots to appear on the leaves. The borders of these spots are a reddish color and surrounding tissue first appears... IrisLeafSpot. Gail Ruhl, Plant Disease Diagnostician, retired.Leafspots caused by the fungus Cladosporium iridis are a common sight on iris. LeafSpot and Bearded Iris.Always remove old dead leaves, and cut off and destroy any leaf or part of a leaf that is affected by leafspot. In the spring, about six weeks before bloom... Iris – LeafSpot. Heterosporium iridis (Didymellina macrospora). Iris – LeafSpot Signs & Symptoms. lesions and accompanying decay on irisleaves. Leafspot (“bacterial leafspot of iris”). Bacteria. Varies; water-soaked rust/black leafspots between veins later dry/fall out, leaving holes; leaves yellow/ distort/wilt/die; stem cankers. The small, brown spots are likely due to irisleafspot. Irisleafspot is a common disease of bearded irises.Irisleafspot is most severe when the weather in spring is cool and wet. IrisLeafSpot. Irisleafspot disfigures leaves and weakens plants. About flowering time, infected leaves are dotted with small, brown spots. Get deals and low prices on Iris leaf spot fungicide on Amazon. Choose from a wide range of gardening supplies and accessories at Amazon. · The fungus causing iris leafspot is Cladosporium iridis and spreads from diseased to healthy leaves during the summer primarily via splashing water. For this reason, infected leaf tissue should be removed as soon as it is observed. View allOct 30, 2025 · Leafspot is caused by a fungus which overwinters on dead leaves and other plant material. Spores develop in spring and infect leaves. Several cycles can occur in warm, wet weather, and the disease thrives on plants growing in acidic soils. Tiny brown spots emerge with water-soaked edges, later turning yellow. · One of the most common diseases affecting irises is fungal leafspot. Iris leaves develop small brown spots. These spots can enlarge quite quickly, turning gray and developing reddish brown edges. Eventually, the leaves will die. Moist, humid conditions are favorable for this fungal infection. MANHATTAN, Kan. — Spring has begun to emerge from winter, and along with it has come the iris leafspot fungus. Kansas State University horticulture expert Ward Upham said now is the time to begin control measures by removing old, dead leaves from iris plants. One of the first signs you may have that your iris is in trouble is the appearance of strange spots on the leaves. Spotting can happen to any iris, although bearded species tend to be most susceptible. · Leafspots caused by the fungus Cladosporium iridis are a common sight on iris. Small, water-soaked lesions develop rather rapidly into 1/2-inch- long spots with brownish purple centers and yellow margins. Get deals and low prices on Iris leaf spot fungicide on Amazon. Choose from a wide range of gardening supplies and accessories at Amazon. · Leafspot is caused by a fungus which overwinters on dead leaves and other plant material. Spores develop in spring and infect leaves. Several cycles can occur in warm, wet weather, and the disease thrives on plants growing in acidic soils. Tiny brown spots emerge with water-soaked edges, later turning yellow. MANHATTAN, Kan. — Spring has begun to emerge from winter, and along with it has come the iris leafspot fungus. Kansas State University horticulture expert Ward Upham said now is the time to begin control measures by removing old, dead leaves from iris plants. One of the first signs you may have that your iris is in trouble is the appearance of strange spots on the leaves. Spotting can happen to any iris, although bearded species tend to be most susceptible. Irisleafspot (blotch or fire) is the most common and widespread disease of both rhizomatous and bulbous species of iris. IrisLeafSpot Didymellina macrospora. Light yellow to tan spots with a light colored center, about 1/4 inch across. Tiny black dots are often visible in the light colored center of the leafspot.
