Canola Watch #17

July 15, 2015

JULY 15 QUIZ — SCLEROTINIA STEM ROT RISK

At this stage of the season, severe stem infection will start to look like this. Source: Debbie McLaren, AAFC

This quiz can help you assess the sclerotinia stem rot risk in canola fields.

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PODCAST: KEITH DOWNEY ON THE INTERNATIONAL RAPESEED CONGRESS

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SCLEROTINIA CYCLE AND SPRAY TIMING

The timing is right for fungicide, but this field is thin (you can still see ground between the rows) and the soils are dry. Credit: Amanda Wuchner

Scattered rain with more in the forecast will have growers wondering this week whether to spray fungicide to manage sclerotinia stem rot. Moisture is the key risk factor for sclerotinia stem rot. Without moisture a couple of weeks before flowering and humidity during and after flowering, disease severity and the return on investment from fungicide will be lower than if moisture is present all through these periods.

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INSECT UPDATE: LYGUS TIMING AND THRESHOLDS, GRASSHOPPERS, BLISTER BEETLES

You might be seeing more root maggots this year, but they're not really something that can be controlled in crop.

Lots of insects are being reported, but agronomists and growers are generally doing a good job of assessing the economic threat and determining that most situations this week do not require a spray. Given the patchy nature of most insect patterns, all fields should be checked. If something is spotted that may be above thresholds, check a few areas of the field before making the final decision.

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KEEP IT CLEAN, KEEP THE CUSTOMER HAPPY

Canada exports 90% of the canola we produce, and our global customers won’t accept anything less than squeaky-clean seed. This time of year, the keys are to ensure a crop protection product applied won’t cause concern for canola exporters, and to know a product’s required interval between application and swathing.

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COMING EVENTS

Crop diagnostic school — July 14-17, Carman, MB
Saskatchewan Agri-ARM tours — July 15, July 21-24
Making the grade — July 28, Olds, AB
Crop diagnostic school — July 28-30, Outlook, SK
Canola Discovery Forum — October 27-28, Canmore, AB

Read more for registration links

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INSECT THRESHOLDS: QUICK REVIEW

While insects are not a major threat in most fields at this point in 2014, diamondback moth larvae are around, cabbage seedpod weevil are still laying eggs, and bertha armyworm larvae have been found in some locations — although at very low levels for the most part. (See the Map of the Week.) Here is a review of thresholds for the four major insects found in canola at this stage of the season…

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HEAT BLAST AND 6 OTHER CAUSES FOR MISSING PODS

As canola starts to move from flowering and into pod formation, growers will often notice blanks up the raceme where pods did not form. Here are 7 possible reasons.

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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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Upcoming Events

John Mayko's canola crop walk

Speakers include Dan Orchard, Kelly Turkington, Breanne Tidemann and more
Aug 21
North of Mundare, Alberta

Webinar: Getting your farm certified for EU exports

It’s a simple and free process that will expand your market access, and most Canadian producers already qualify. Please join us for a webinar to learn more about this opportunity.
Aug 22

canolaPALOOZA late season crop walk

Join us for one last look at the 2019 canolaPALOOZA plots
Aug 28
Lacombe, Alberta

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