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Timing of glyphosate application: Agronomists and retailers continue to get questions about spray timing for glyphosate on Roundup Ready canola. The answer: Anytime up to and including the 6-leaf stage of the crop. Applying at the cotelydon stage is OK. See your provincial guide to crop protection for more information. Click your province for a link to your guide: Alberta Saskatchewan Manitoba
Manitoba Agriculture, Food and Rural Initiatives has revised the glyphosate chart we attached to Canola Watch 3. Click here for the revised PDF file. If you printed out the original, replace it with the new version. The chart includes all glyphosate products available, including amount of active ingredient per litre, salt type and container size.
Mistaken diagnosis: Gophers ate 100 acres of canola around Sedgewick, Alta. The grower thought it might be cutworm, but with scouting discovered the real culprit. Strychnine baits and, in some jurisdictions, mix-it-yourself strychnine liquid is available for gopher control. Talk to your municipal or county office for options in your area.
Sclerotinia risk: With all this moisture, many growers and retailers have asked us if that means a higher sclerotinia stem rot risk. It depends. Sclerotinia sclerotia do not tolerate saturated soils, so very wet conditions could reduce the apothecia germination and spore production from those fields. But in areas with good moisture and great yield potential, canola may be at higher risk. When flowering starts, use the CCC’s Canola Disease Scouting & Risk Assessment Card to help determine whether a spray is warranted.
Ruts in the field: Wider tires and lower tire pressures can improve sprayer flotation and reduce rut depth, but if the operator doesn’t have time to switch tires, then keep in mind the desired harvest direction before spraying a wet field. Make ruts parallel with the intended direction of travel for the swather and combine so growers can keep up their harvest speed.
Coming Event: CCC senior agronomy specialist Doug Moisey will lead a diagnostic tour June 22 at Lakeland Agricultural Research Association’s site at Fort Kent, Alta. The tour runs from 12:00 to 3:00 and lunch is included. Call 780-826-7260 to register.
Coming event: AAFC’s research centre in Lacombe is hosting a canola research tour Wednesday, June 30 from 9:30 a.m. to 3:30 p.m. Pre-registration is required. Lunch is included. Click here for more information and to register.
Coming Event: The Crop Diagnostic School in Carman, Manitoba will run July 6 to 9 and July 12 to 16. Attendance for a number of those days is already full. Click here for more information and to register.
Yellow canola: Wait for moisture stress to ease
Canola under the stress of too much moisture will turn yellow, because roots starved for oxygen can’t take up nutrients.Wait until the ground dries up and roots can get working again before rescuing the crop, In short, save your money until you know the crop will survive.
Topdressing fertilizer may help when new green leaves start growing and when good growing conditions return. Sulphur in the form of ammonium sulphate can provide an economic return when applied up to the bolting stage. Nitrogen applied past the 6-leaf stage is unlikely to provide an economic benefit.
Tissue tests to determine nutrient deficiency may be unreliable this year in areas suffering unusual moisture stress.
