One big spray
Excess moisture, spraying delays and weeds were the top yield robbers again this week, same as last week. These challenges in combination with advancing crops and weeds, a lot of canola will get just one pass of herbicide this year. Crop stage and max labels rates depend on the system.
Last kick at the blackleg can
Fungicide labels may say, in many cases, that the window for blackleg on canola is from the two- to six-leaf stage...but six-leaf is usually too late to prevent early infection that drives yield loss. Application around the two-leaf stage is best, if the situation justifies a spray.
Remember 2024? It was a bad blackleg year. Fields with canola this year that were in canola in 2024 will be at higher risk, especially if the cultivar is the same. Moisture could increase early infection rates. Relative humidity of 80 per cent or higher and cool temperatures of 13-18°C are conducive to blackleg infection.
Tank mixing fungicide with herbicide can save a field pass, as long as timing works for both targets (weeds and blackleg) and that the tank mix is approved. Pesticides Regulatory Directorate’s tank mix rules say… In order for tank mixing to be permitted, there must be text on the product label that specifically allows for tank mixing. This text may be in one of two forms: a specific mention of the tank mix partners (for example, Product X may be tank mixed with Product Y), or the general label statement that permits tank mixing. Registrants can provide specific advice and recommendations for tank mixes of products that contain the required label statements.
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