The Iris Patch - Specialising in Louisiana Iris - based in Whangarei, New Zealand
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Pests and Diseases

Louisiana irises are not subject to many disease problems, although those two common problems, rust and leaf spot can devastate them. 
Treatment is with any suitable fungicide - Mancozeb seems to be the most effective—and it should be applied quickly and at weekly intervals if either of the problems arise. Prevention would be regarded as far more acceptable than cure. If leaf spot does occur, and it will on certain cultivars in humid weather or when cool nights are followed by warm days, then removal of the infected leaves and treatment of the others is advisable. 



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