The RHS believes that avoiding pests, diseases and weeds by good practice in cultivation methods, cultivar selection, garden hygiene and encouraging or introducing natural enemies, should be the first line of control. If chemical controls are used, they should be used only in a minimal and highly targeted manner.
- Do not allow fallen, scab-affected leaves to remain at the bottom of the plant over winter – collect them up and dispose of them
- Prune out affected shoots
- General pruning to open up the canopy will lead to better air circulation and more rapid drying of the foliage after rainfall
- Resistant cultivars are available for some plants. Resistant apple, pear and pyracantha cultivars are listed in the separate profiles on apple and pear scab and pyracantha scab
There are no fungicides available to home gardeners for the control of scab diseases on edible crops.
The fungicides tebuconazole (Provanto Fungus Fighter Concentrate), tebuconazole with trifloxystrobin (Provanto Fungus Fighter Plus, Toprose Fungus Control & Protect), and triticonazole (Fungus Clear Ultra) are labelled for the control of a number of other diseases on ornamental plants, and may give some control of scab diseases.
The following products contain a combination of both insecticide and fungicide, enabling the control of both insect pests and disease: myclobutanil containing cypermethrin (Resolva Rose 3 in 1, Rose Shield Bug & Fungus Killer, Roseclear Ultra Gun 2, Rosegarde) and triticonazole containing acetamiprid (Roseclear Ultra, Roseclear Ultra Gun).When a proprietary product contains an insecticide as well as a fungicide it would be preferable to use an alternative product if pests are not a problem on the plants treated.
Fungicides are likely to need several applications during the growing season, particularly when spring and summer are wet.
Inclusion of a product does not indicate a recommendation or endorsement by the RHS. It is a list of products currently available to the home gardener.
Fungicides for gardeners (Adobe Acrobat pdf document outlining fungicides available to gardeners)
Chemicals: using a sprayer
Chemicals: using safely and effectively
Chemicals: storing and disposing safely