Patchy emergence due to a few weeks of dry and then a rain, or due to reseeded crop emerging among the few original plants, has created a wide range of stages in some crops. Make herbicide timing decisions based on the stage that represents the highest proportion of plants. And rather than planning on two applications, growers may be better off spraying once at the highest registered rate when weeds that are more advanced than the crop, and with rapidly growing canola plants.
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Insecticides for variable staged crops
Cabbage seedpod weevils are one example of an insect where crop stage is a factor in the management decision. Weevils lay their eggs in developing pods, and these larvae feed on canola seeds inside the pods. The rule of thumb is pods less than 3/4” are too small for egg laying. If some plants are…
Get the most out of your herbicide application
—Tips for windy conditions. Too windy, according to the Guide to Crop Protection, is wind above 15 km/h. A low drift nozzle to spray weeds in windier conditions is preferable to waiting longer for a relatively calm day suitable for a finer spray. More tips on spraying in wind. —Spray within label crop stages. Crop…
Crops and Weeds – How to Spray Variable Stages
Crop growth and development is variable within many fields in western Canada. A common question being asked is when is the best time to spray? Each field should be considered on a case-by-case basis. Keep in mind a few important points: The first step is to scout. Scout the crop for signs of stress (moisture)…
What is the goal with a late herbicide spray?
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