Canola Watch – August 10, 2016

August 10, 2016

CANOLA WATCH QUIZ — PRE-SWATH DISEASE CHECK

Blackleg_woody_crown_ClintJurke600

Test your disease ID knowledge. Match the disease to these four images…

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VIDEO LIBRARY: HARVEST THEME

Pre-swath disease scouting

These seven videos will help growers with harvest and storage decisions.

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STRAIGHT COMBINING CANOLA — SUCCESS FACTORS

Here are factors that create the ideal situation for straight combining canola….

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LATE SWATHING OR STRAIGHT COMBINING?

If canola is to be swathed later than optimal (with earliest pods shattering), cut in moist conditions (rain or heavy dew) to limit shattering as much as possible.

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SWATH TIMING AND DISEASE

Alternaria infection

With blackleg, sclerotinia stem rot and clubroot, base the swath timing decision on healthy plants that will contribute to yield. One exception where early swathing could provide an economic benefit is the case of severe alternaria black spot (shown).

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SWATH TIMING FOR UNEVEN CROP

With distinctly different stages, it would be possible to swath these sections separately. Source: Nicole Philp

If half the plants are ready and half are just beginning seed colour change, growers may want to hold off on swathing. By waiting 3 or 4 days, there is minimal risk for riper parts of the field and a huge potential benefit for later parts.

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SWATHING TIMING AND LODGING

Lodged canola.

There is no clear advantage to swathing versus straight combining lodged crop. It often comes down to personal preference.

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BERTHA ARMYWORM: A FEW WARM SPOTS

Bertha armyworms, various colours. Photo credit: Devin Pendree

While economic levels of damage have not been reported anywhere yet this year, individual fields could experience isolated high numbers.

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SWATH TIMING: PLANT POPULATION AND SCC

With fewer plants, a higher ratio of seeds comes from side branches. (Click image to enlarge.)

Yield and quality benefit from leaving canola standing longer before swathing. The common recommendation is to wait until at least 50-60% seed colour change (SCC) on the main stem. But that may be overly simplistic — especially if plant populations are low. The graph shows that as plant populations drop, more and more yield will come from side branches.

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PRE-HARVEST SCOUTING: 8 DISEASES

Sclerotinia stem rot. Credit: Justine Cornelsen

Check patches of pre-mature ripened canola to identify the cause. It could be blackleg, clubroot, sclerotinia stem rot (pictured) or something else entirely. Here’s how to identify the major diseases of canola as fields get close to swathing stage…

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PRE-HARVEST PRODUCTS FOR USE IN CANOLA

Glyphosate is registered for pre-harvest perennial weed control in canola. Glyphosate is to be applied when the majority of seeds are yellow to brown in colour and seed moisture is less than 30%. Heat fits between glyphosate and Reglone on the speed of dry down spectrum. Reglone is a contact herbicide (only kills what it contacts) and is registered in canola to dry immature green material to facilitate harvest. Reglone shuts the plant down quickly and basically STOPS it from maturing, which can lock in high green seed levels if applied prematurely.

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Canola Watch is a free, unbiased, timely and research focused weekly newsletter from the Canola Council of Canada Crop Production Team

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