Garden Pests and Diseases: Whats wrong with my Iris, 1 by tillysrat

tillysrat wrote:
I don't use any type of herbicide, The only thing that I have sprayed for is i had aphids on my lupine that is about 3 to 4 feet away and that was about 4 wks ago
I have two plants and the one I found this on was further away.
Could it be possible that they need to be divided ?
It says they should be done every 3 years. But I don't know if I should do that if they have a disease.
Heres a pic the one that I got the leaf is on the left.