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Antirrhinum Rust



P_antirrhinumrust1

Antirrhinum Rust

Usually appear in

Spring to Autumn.


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Caused By:-     The Fungus Puccina antirrhini

Description

Spray with any good fungicide especially those containing containing penconazole or mancozeb. Grow cultivars with claimed resistance to rust. However, there are probably a number of different strains of the fungus, and new races are always developing in nature, so rust still sometimes affects "rust-resistant" Antirrhinum. Regular early sprays with the above fungicides before the disease gets a hold will help control rust. Destroy plants at the end of the season to avoid carry-over of fungus spores.
See also these other rusts Anemone, Bean, Bluebelle, Cedar Quince, Chrysanthemum White, Fucshia, Gladiolus, Gooseberry, Hollyhock, Juniper Pear, Mahonia, Mint, Pear Juniper, Pelargonium, Periwinkle, Plum, Potato Internal, Quince, Rhododendron, Rose, Rust, White.


Control

Spray with any good fungicide especially those containing containing penconazole or mancozeb. Grow cultivars with claimed resistance to rust. However, there are probably a number of different strains of the fungus, and new races are always developing in nature, so rust still sometimes affects "rust-resistant" Antirrhinum. Regular early sprays with the above fungicides before the disease gets a hold will help control rust. Destroy plants at the end of the season to avoid carry-over of fungus spores.
In the European Community the products permitted under organic regimes have little effect rusts. Fungicides containing myclobutanil (Bayer Garden Systhane Fungus Fighter and other formulations), penconazole (Westland Fungus Attack) and triticonazole (Scotts Fungus Clear Ultra) can be used to control rust, but care should be excercised when using these fungicides.
The fungus is encouraged by high humidity with a lack of air circulation. In greenhouses it is best to keep air circulation high and conditions on the drier side.
It overwinters on old plant materials so these should be burnt.
As with any fungal disease one of the best ways of preventing it is by good hygiene. Remove and burn all dead leaves in autumn to prevent the spores from over wintering. If the leaves is from an infected plant burn them.
Water the compost of susceptible plants directly trying not to wet the foliage as the rust needs a period of leaf wetness to germinate and infect.
Watering the soil in the dormant season with Jays fluid or Amarillotox should also help. In some Countries these products are not licensed for this use.
Maintain an open structure to allow good air circulation through the plant and ensure greenhouses are always well ventilated. Often there are resistant varieties of the plant you wish to grow.
Avoid over application of nitrogen, which produces soft growth which is more susceptible and ensure adequate potassium fertiliser.

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