Scottish Rock Garden Club Forum

General Subjects => General Forum => Topic started by: JPB on June 06, 2011, 08:37:26 AM

Title: Is it a virus???
Post by: JPB on June 06, 2011, 08:37:26 AM: My Iris foetidissima has yellowish spots on some leaves. Could it be a virus?
Title: Re: Is it a virus???
Post by: johnw on June 06, 2011, 01:00:42 PM: Quote from: Hans Pakker on June 06, 2011, 08:37:26 AM
My Iris foetidissima has yellowish spots on some leaves. Could it be a virus?

Hans - Mine is viral and is streaked rather than spotted. It lives on but is decidedly tired. It caught it from the variegated form which quickly died.

johnw - another week of rain ahead.
Title: Re: Is it a virus???
Post by: Ezeiza on June 06, 2011, 05:38:55 PM: Hans, looks more like rust. Do you fertilize with high nitrogen or manure?
Title: Re: Is it a virus???
Post by: JPB on June 07, 2011, 07:22:31 AM: Alberto, this plant has not been fertilized very much. So excess nitrogen is not likely. If it is a rust, then I should see sporangia after some time. I'll keep an eye on the plant...
Title: Re: Is it a virus???
Post by: Ezeiza on June 07, 2011, 03:32:06 PM: Hans, if you gently rub a piece of toilet paper along the leaf and an orange trace is left, you have it.
Title: Re: Is it a virus???
Post by: JPB on June 08, 2011, 06:22:10 PM: Alberto, no orange stuff, but if it is a fungus, It may not yet be developping spores. I'll check if it develops later. Thanks for the suggestion :)