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Sclerotinia of Canola Risk Forecast for North Dakota
6/16/2010
The first sclerotinia risk map of 2010 is out. Risk estimation for June 16 is low. Most canola fields are still in the bolting stage, stage that is not susceptible to Sclerotinia. While environmental conditions have been cool and humid in the past several days in many canola producing areas of the state, apothecia have not emerged yet, and the cumulative values for infection have not reached critical levels. This could change in the next few days if additional rain falls in the area.
Fungicides registered for control of Sclerotinia stem rot in North Dakota are: azoxystrobin (Quadris), boscalid (Endura), metconazole (Quash), prothioconazole (Proline), pyraclostrobin (Headline), and thiophanate methyl (Topsin). Also, the biological control compounds Serenade, Ballad Plus, and Polyversum are registered for use against Sclerotinia in foliar applications. For application rates consult your extension agent.
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Blackleg
* While most canola cultivars are moderately resistant or resistant to blackleg isolates from PG2, new strains that can attack these cultivars are increasing in prevalence in canola growing areas of North Dakota. Currently, the only product registered for use against blackleg is azoxystrobin (Quadris). Quadris should be applied when canola plants have four or less leaves. Older plants are in general less prone to develop the stem cankers that are responsible for yield loss, and thus the economic return of a fungicide application may be reduced.
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