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Timothy from Milton Freewater, Oregon writes

What is the best treatment regimen for Botrytis Convoluta in bearded iris?

I have a large commercial iris garden and would like to control the incidence of Botrytis convoluta in new plantings. I live in the Columbia Basin of eastern Washington/Oregon, and this problem is a nuisance. Not damaging to established clumps, but can be a problem new plantings. Most of the incidences occur late winter to early spring. Problem abates by early summer. Drainage is excellent, and the field is in full sun. Soil is a volcanic based silt loam.


According to the Penn State Extension Office:  "Do not plant infected rhizomes. Destroy infected plants." It would be best to reach out to your local cooperataive extension office or a local nursery who have experience with Iris diseases and a treatment regimen. We do carry a product called OHP Strike Plus 50 WDG Fungicide that's labeled to treat for Botrytis as well as Cleary 3336F Fungicide.

Answer last updated on: 03/29/2017

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