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Tuesday, June 30, 2020

When To Spray Your Canola With Fungicide

Spraying a fungicide is a key component to disease management in canola.

The moist soil and humid conditions we have been experiencing so far this year are making ideal conditions for sclerotinia to make an appearance in crops

Sclerotinia is a soil and stubble-borne disease that infects the petals and stem during flowering. Spraying a fungicide can reduce the incidence of disease by up to 80% when applied at the right time, which is why timing your spraying is so important.

The goal of fungicide application is to cover as many petals as possible, which typically corresponds with 30% bloom. The application window can be between 20-50% bloom, however 30% flowering is the optimal plant stage.

So how do you determine 30% bloom?

To determine the stage of bloom, you will want to check multiple locations within the field and count the number of flowers on the main stem. Be sure to count all flowers - which includes flowers, aborted flowers and developing pods.

10 Flowers on main stem 10% Bloom
14-16 Flowers on main stem 20% Bloom
20 Open Flowers on main stem 30% Bloom
20+ Open Flower on main stem 50% Bloom

50% bloom is also when the crop is at its most yellow, when you see the side branches starting to flower.

Typically, once canola starts flowering you can plan to be out spraying in a weeks time, weather depending. In good weather conditions you will see up to 4 flowers opening per stem each day.

Proper timing of fungicide is extremely important to protect your canola investment, so be sure to check your fields regularly.

For more information on fungicide application or determining the right stage of bloom in your canola, contact our agronomist Chelsea Pearce at chelsea.pearce@martindeerline.com or 780.349.3391.

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