- Pick off and destroy affected leaves if only one or two show symptoms. Monitor the plants closely for any further development of symptoms
- Severely affected plants should be removed and disposed of as soon as possible. Ensure that no debris remains on the soil surface
- Avoid dense plantings, so that air can circulate freely around the plants
- Avoid overhead watering, particularly where the disease is present
- Do not save seed from affected plants
- If repeated infection occurs, consider replacing lupins with another herbaceous plant
There are no fungicides available to gardeners with specific recommendations for use against lupin anthracnose. However, the fungicides myclobutanil (Doff Systemic Fungus Control and other products), tebuconazole (Bayer Garden Multirose concentrate2) and triticonazole (Scotts Fungus Clear Ultra) are labelled for the control of some other diseases on ornamental plants, and could therefore be used legally on lupins (at the owner’s risk) to try and control anthracnose.
There is no specific information available as to the efficacy of these products against lupin anthracnose, however. It is likely that repeated sprays will be required where the disease is present, particularly during unsettled weather. It would be prudent to apply a small amount of the chosen fungicide first, at a solution suggested on the packet for other problems, to ensure that the product will not cause plant damage.
Fungicides for gardeners (Adobe Acrobat pdf document outlining fungicides available to gardeners)