Agricultural crops :: Oilseeds :: Rapeseed and Mustard
White Rust: Albugo candida
Symptom
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White to creamy yellow pustules develop on the lower leaf surface. The pustules, later coalesce to form patches on the lower leaf surface.
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Tan-yellow spots develop on the upper leaf surface opposite the pustules.
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Pustules may also form on the pods. Infected flowers develop a "staghead" in which the flowers are sterile, malformed and green, and various flower parts may be thick and club-shaped and greatly enlarged.
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Most turnip or Polish varieties of canola as well as brown and oriental mustard are susceptible.
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Yield losses are about 1% for each 1% of staghead observed in a field. Yield losses in Manitoba are usually less than 10%.
Management
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Argentine varieties are resistant. If growing Polish type canola, select resistant varieties.
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See current variety recommendations for information on susceptibility.
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Use at least a three year crop rotation. Control volunteer canola and susceptible mustard-type weeds in the rotation.
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