Iris fungal leaf spot

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playinindirt Harwinton, CT Apr 20, 2015

I need help with this problem. What is the pre-treatment, if any, to prevent my irises from getting fungal leaf spot? I get this every year in my garden. I am in the northwest hills in CT.

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Diana_K Contra Costa County, CA(Zone 9b) Apr 20, 2015

Most fungi are well controlled by spraying ahead of time with various products. These materials need to be on the plant so that when the fungi germinate they are killed before they can enter the plant. Timing and product will vary. If you are having a really wet season then several sprays might be needed. Adding a spreader sticker can help the material stick to the leaves, but eventually it washes off, and you need to protect the new leaves as they emerge.

http://www.irises.org/About_Irises/Cultural%20Information/Pests_Diseases.html

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