Carrington Research Extension Center
North Dakota State University
NDSU Extension Service
North Dakota Agricultural Experiment Station

Ag Alert

June 24, 1999


The following is this week's CREC 'Ag Alerts' for your review and use. The information also will be entered at the following website address: Greg Endres.


Much of the canola in south-central North Dakota is beginning to flower. With the start of flowering, the plant becomes susceptible to sclerotinia infection. Early bloom also is the time to consider a fungicide application to suppress the disease. Currently, Quadris is the only fungicide registered for sclerotinia suppression in canola. The fungicide should be applied at 10-25% bloom, or about 3-7 days after flowering begins. There will be 10-18 flowers on the main stem of Argentine canola when it is at 10-25% bloom. Quadris at 9.2 fluid oz/acre is labeled for light to moderate disease pressure and costs over $21/acre.

A decision to spray should be made only under the following conditions: 1. Yield potential is 2000 lb/acre or more, 2. Weather leading to early bloom has been wet (at least 1-2 inches of rain in the 2 weeks prior to bloom), 3. More rain or high humidity is expected, and 4. Sclerotinia has been a problem in recent years in the field currently grown to canola or in nearby fields.

Details on management of sclerotinia in canola are in NDSU Extension Report 54 'Sclerotinia stem rot of canola, biology and management', which is available at NDSU Extension Service offices.

Greg Endres, Area Extension Specialist/Cropping Systems, Email:
1999 Ag Alert Archive * Carrington R&E Center Home Page * NDSU Agriculture