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| Antirrhinum diseases |
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Antirrhinums can sometimes be affected by rust, and other fungal diseases, and there reports that the disease is seed-borne, but this has not been confirmed as fact.
The symptoms are small, dark brown pustules on the undersides of leaves, and pale dimples on the upper surface.
In severe attacks leaves shrivel and die.
The problem is spread by airborne spores, which over winter on plants kept from one season to the next.
Destroy plants at the end of the season to avoid carryover of fungus spores.
Prevention is better than cure so use cultivars that are reputed to be rust resistant.
Regular spraying with a suitable fungicide to the manufacturer’s instructions should control the problem.
Antirrhinums affected by powdery mildew, can also be controlled with the same fungicides.
Those affected with root rot disease, a soil-borne fungal pathogen, cannot be chemically treated, rotation or changing the soil are the only controls for this problem.
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