Saskatchewan gardens frequently see infection of roses, saskatoons, hollyhocks, and sunflowers — all caused by different rust species.
Wild rose with extensive rust infection of the stem.Infection often starts on the lower part of the plant, probably because rust likes the humid conditions found in the lower foliage. Usually, foliage on the bottom of the plant succumbs first, and then the disease moves its way up the plant. In the fall, the leaves or stems will develop black spores.
Rugosa roses are very resistant to rust and hybrids are more susceptible, so check which to plant if you are having rust problems. There are also fungicides that can be used if the disease is problematic.Sunflower rust is also very host specific. The rust pustules only occur on sunflowers, forming on the underside of lower leaves first. They are cinnamon-brown and dusty, as they contain the spores that spread disease.
Infection of saskatoon bushes occurs in the spring, when tiny windborne spores are produced on juniper shrubs. The shrubs are infected with the fungus several years previously, and they cause the plant to grow hard, woody galls. In damp weather at the end of May, long orange jelly-like masses grow quickly out of the galls. The tiny spores present in these jelly masses are splashed around when it rains and the spores are then blown by the wind to saskatoon bushes that are just leafing out.
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