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Gooseberry Rust



P_goosebyrust

Gooseberry Rust

Usually appear in

Spring and Summer


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Caused By:-     The Fungus Puccinia caricina

Description

Gall produced by Nettle Clustercup Rust fungus Puccinia caricina DC. on common nettle Urtica dioica L.
The Genus Puccinia causes rust in many plants. In Gooseberry the species is P.Caricina which is a parasitic fungi that grow on gooseberry bushes. The same species also attacks other Ribes, Sedges and Nettles. In the spring orange coloured pustules form first on the underside of the older leaves or sometimes on the stem where it might cause a gall to form. Later in the summer the cluster cup stage of the fungi develop on the pustules which can causes the leaves to curl. Picture from Wikimedia Commons.
See also these other rusts Anemone, Antirrhinum, Bean, Bluebelle, Broad Bean, Cedar Quince, Chrysanthemum White, Fucshia, Gladiolus, Hollyhock, Juniper Pear, Mahonia, Mint, Pear Juniper, Pelargonium, Periwinkle, Plum, Potato Internal, Quince, Rhododendron, Rose, Rust, White.


Control

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.
Badly infected leaves and branches should be removed and the plant sprayed with a suitable fungicide. Sedges and Nettles should not be grown near the Ribes plants.
The fungus is encouraged by high humidity with a lack of air circulation.
It overwinters on old plant materials so these should be burnt.
Spraying with a suitable fungicide is necessary and must be carried out several times.
As with any fungal disease one of the best ways of preventing it is by good hygiene. Remove all dead leaves in autumn to prevent the spores from over wintering. If the leaves is from an infected plant burn them.
Check plants regularly and remove infected leaves by hand as soon as they are seen and then spray with a suitable fungicide. Spray the plant and the soil around it with a fungicide suitable for the control of rust fungus.
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. Rotate bean with non-host crops.
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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