- Remove and destroy infected leaves as soon as infections are seen
Products containing myclobutanil (Bayer Garden Systhane Fungus Fighter*, Bayer Garden Fungus Fighter Disease Control*, Doff Systemic Fungus Control and other formulations), tebuconazole (Bayer Garden Multirose Concentrate 2) and triticonazole (Scotts Fungus Clear Ultra, Roseclear Ultra) are approved for use on ornamental plants for control of rusts. They would probably also give useful control of leaf spot fungi, although this is not claimed by the manufacturers.
Some formulations of tebuconazole, myclobutanil and triticonazole insecticides to control pests. Avoid these unless an insect pest problem is specifically identified.
*NB: The following products are being withdrawn: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.
Fungicides for gardeners (Adobe Acrobat pdf document outlining fungicides available to gardeners)