- Raking up and destroying fallen leaves from anthracnose-infected trees will only be of limited value, because it is lesions remaining on the tree which are the most important source of infection
- On young trees prune out infected shoots promptly. Damage done by bark infection is proportionately more severe when the stems are small
Resistance: Salix × sepulcralis var. sepulcralis and S. 'Erythroflexuosa' are resistant to anthracnose and other willow species are hardly affected. Salix alba var. caerulea, S. pentandra and S. purpurea are resistant to one or both of scab and black canker.
There are no chemical controls specifically available for these diseases and it would not be practicable to spray mature trees in any case.
Fungicides containing myclobutanil (Bayer Garden Systhane Fungus Fighter and other formulations*), tebuconazole (Bayer Garden Multirose Concentrate 2) and triticonazole (Scotts Fungus Clear Ultra and Roseclear Ultra) are available for the control of rust diseases on ornamental plants and may be applied to willows for rust control. They will probably give useful control of these other diseases, although this is not claimed by the manufacturers, and could be valuable for protecting young, establishing trees.
Some formulations also contain insecticides but these are best avoided if no insect pest problem is specifically identified. For example, some formulations of myclobutanil (Westland Rose Rescue) contain cypermethrin, some formulations of tebuconazole (Bayer Garden Multirose Concentrate 2) contain deltamethrin, and some formulations of triticonazole (Scotts Roseclear Ultra and Scotts Roseclear Ultra Gun) contain acetamiprid.
*NB: The following products are being withdrawn: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)