Brown Spots on Iris Leaves - Knowledgebase Question

La Crosse, WI
Question by pgleason8
February 22, 1998
About mid summer brown spots began to develop on the leaves of my iris. They started small, with brown centers outlined in yellow. Eventually the entire leaf would shrivel and die. This "jumped" to the day lilies nearby and the same thing started happening to their foliage. I was told it was probably mold or a fungus and things would be fine this season. I want to prevent this from happening this year. What do you suggest?


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Answer from NGA
February 22, 1998

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The fungus that's attacking your plants overwinters on dead leaves and other plant remains, so be sure to clean the iris bed up and remove any plant debris. Spores are produce in spring and infect leaves, especially if the weather is warm and wet. Tohelp prevent infection, and the spread of infection, give your plants enough space between so the leaves are not touching one another. You can apply a garden fungicide such as lime-sulfur to the leaves if you notice spots beginning this spring. Don'tspray until the leaves are 6-8 inches high. You may have to spray every 10-14 days if the weather remains warm and wet.

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