- Remove all affected leaves promptly and destroy
- Do not allow dead, infected material to remain around the plants, since this will be a source of infection in the following season
The fungicides myclobutanil* (Doff Systemic Fungus Control and other formulations), tebuconazole (Bayer Garden Multirose concentrate2) and triticonazole (Scotts Fungus Clear Ultra) are available to gardeners for control of several problems on ornamental plants. They may give useful control of hellebore leaf spot, but do not carry any recommendations for this problem.
Products containing plant and fish oil blends (Vitax Organic 2 in 1*) may be used on any plant and carry a recommendation for ‘Helminthosporium,’ a broad term for a number of leaf spots; they may give useful control, but again, are not specifically recommended.
*NB: The following products are being withdrawn:
Myclobutanil (Bayer Garden Systhane Fungus Fighter concentrate and Bayer Garden Fungus Fighter Disease Control). These products cannot be sold after the 30th November 2015 and remaining stocks must be used or disposed of before the 30th November 2016.
Plant and fish oil blends (Vitax Organic 2 in 1). These products are being withdrawn but as they are not registered fungicides there is no date by which stocks have to be used up before.
Fungicides for gardeners (Adobe Acrobat pdf document outlining fungicides available to gardeners)