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Written by: Kelsey Banks, Ottawa-Rideau Regional Communication Coordinator
Every crop season the same question is asked, “Should we apply fungicide or not?” The answer from many agronomists—it depends on many factors. This answer can annoy some growers, but it is important to consider the factors before applying fungicide to determine its value and if it should be applied. To determine the value of a potential fungicide application, you should work with your agronomist to determine the answers to the following questions:
What was the growing environment and what is the current environment like?
In most parts of Ontario, our growing season tends to be a bit humid. Some years, the growing environment is humid and wet. In these types of growing environments, disease is more prone to grow on the plants. Consider what conditions the crop has been growing in and what the growing environment is before application.
Canola Crop in full bloom.
What is the purpose of this crop?
Some crops may require a fungicide as a ‘just in case’ due to its end market. It is recommended to review your contract that you have signed when growing any dry beans or identity preserved (IP) soybeans to see if fungicide application(s) may be mandatory. If the crop is being grown for feed, depending on other factors, it may be worth applying fungicide to avoid livestock health issues like mycotoxins. If the crop is being grown for grain corn, it may be beneficial to speak with your agronomist to discuss if it is of value to apply the fungicide or not and create a strategic plan to avoid deductions at the elevator when delivered.
Does the soil have a history of diseases like white mould?
Some soils have a history of having different types of diseases in their fields with specific crops. One of the most troubling diseases, in eastern Ontario especially, is white mould in soybeans. For fields that have a past and continuous history of disease, applying a fungicide could be very beneficial.
Are there any signs or symptoms of disease starting to show?
Whether you scout your fields alone or with an agronomist, it is very beneficial either way to see if your crop is starting to show any signs of a disease starting.
Something to consider while scouting is to look for a sign or symptom of plant disease. A sign of plant disease is physical evidence of the pathogen. A symptom of plant disease is a visible effect of disease on the plant. While scouting, look for signs and symptoms of fungal and bacterial diseases and symptoms of viral diseases.
To discuss the value of fungicide application on your farm, please contact your local agronomist.