What's the problem here?

kudzu9(Zone 8a - PNW)May 12, 2010

My neighbor has a big bed of irises, and most of the bed looks healthy, but about a fourth of the plants, mostly at one end of the bed, have weird looking leaves. We're in the Seattle area, where we have had a cool spring, normal amount of rain, and temperatures mostly in the high-50's so far. What can you tell from this picture?

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to me that screams bugs or fungus. i default to soapy water treatment for either of those two problems.

i'd spray them once every other or every third day with dishsoap mixed in water (like about a tablespoon per cup, or until the water is tinted the colour of your soap). if the problem doesn't get better then try and find something for that specifically. the soapy water can't hurt the plants and it's cheap.

    Bookmark   May 12, 2010 at 12:53PM
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iris_gal(z9 CA)

Iris leaf spot. Nothing to be worried about. Just ugly. You can discard leaves like this. If you spray with a fungicide it will only inoculate uninfected parts of the leaves. Bad some years, other years none (without spraying). Rain isn't the factor. Don't believe anyone knows.

May use rose fungicide or Daconil - no reports of one being superior to the other.

    Bookmark   May 12, 2010 at 8:35PM
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