Root rot of canola caused by Leptosphaeria maculans is widespread in southern NSW and can arise from foliar infection
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چکیده
Root rot symptoms caused by Leptosphaeria maculans were first reported in Australian canola crops in 2001 but little is known about their importance and prevalence. In a survey of over 100 commercial canola crops in southern NSW, all paddocks had plants with root rot symptoms in 2004, whilst 86% of paddocks did in 2003. Across the two seasons surveyed, there was a strong relationship (r = 0.63) between the mean severity of root rot and stem canker recorded within a paddock. The pathway of infection under field conditions appears to be via foliar infection, whereby the pathogen enters through the leaf or cotyledon and then travels down the plant and into the roots. Root rot symptoms appear at early flowering and increase in incidence and severity as the plant matures. The current recommendations for blackleg control, such as the use of the fungicides Impact and Jockey, reduce the severity of root rot.
منابع مشابه
Detection of Leptosphaeria maculans and Leptosphaeria biglobosa Causing Blackleg Disease in Canola from Canadian Canola Seed Lots and Dockage.
Blackleg, caused by Leptosphaeria maculans, is a major threat to canola production in Canada. With the exception of China, L. maculans is present in areas around the world where cruciferous crops are grown. The pathogen can cause trade barriers in international canola seed export due to its potential risk as a seed contaminant. The most recent example is China restricting canola seeds imported ...
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