Canola Watch – June 6, 2018

June 6, 2018

CANOLA WATCH QUIZ – SCOUTING AFTER EMERGENCE

Five questions (including two survey questions) on observations and actions when scouting in the first week or so after seeding.

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MAP OF THE WEEK – GENERAL PRECIPITATION

Most areas of the Prairies got some rain over the past week, according to this AAFC map.

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SPRAY EARLY: ECONOMICS OF EARLY WEED CONTROL

One of our Alberta agronomy specialists encountered the situation in the photo. Canola emergence was patchy in this small area, but generally good overall. The bigger issue was the big population of tiny weeds. The agronomy specialist wondered if these buckwheat seedlings, though very abundant, were too small to spray? The answer is no.

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BLACKLEG DECISION: WHEN DOES A FUNGICIDE PAY?

Blackleg infection at or just after the cotyledon stage is the mostly likely to cause any significant yield loss. If fungicide to control blackleg is to provide any economic benefit, it has to be applied very early in the season and the crop has to be at risk of early and fairly widespread infection. With good management, including a two-year break between canola crops, growing blackleg resistant varieties and rotation of R genes, fungicide is not necessary. In that situation, fungicide to reduce blackleg losses does not usually provide an economic return.

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SCOUTING 7 TO 21 DAYS AFTER SEEDING: WHAT TO LOOK FOR?

With warm soils, decent moisture and 1” seeding depth, emergence can occur about a week after seeding. If emergence is slow or patchy, scout to find out why. The first 21 days are critical to a successful canola crop.

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READER QUESTION: WILL PLANTS SURVIVE FLEA BEETLE STEM FEEDING?

If the tissue underneath the bite is still living, the seedling will likely survive as long as (1) the stem can still bear the weight of the cotyledons and first leaves, (2) the stem is not to subjected to more feeding, and (3) weather conditions are good for plant growth.

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CUTWORMS: TIMELY SCOUTING AND SPRAY DECISIONS

Include cutworms on the scouting checklist for the first one to three weeks after emergence. Any later and management becomes more difficult because (i) spraying a registered insecticide is useless because the cutworms have developed beyond the feeding stage, and/or (ii) reseeding options are starting to be limited.

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WHAT CAUSES HERBICIDE CARRYOVER DAMAGE?

Factors that affect herbicide carryover are herbicide group, field history, soil characteristics, dry conditions and temperature.

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CANOLA USUALLY RECOVERS FROM EARLY-SEASON HAIL

Hail on canola, June 21, 2015. Credit: Val Katerenchuk

Early season hail rarely has an impact on canola yield potential. Hailed seedlings usually come back very well. Even when individual plants die, a whole canola crop is fairly resilient to early season hail when it comes to overall yield potential.

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PHOTOGRAPHY TIPS FOR AGRONOMY

Mystery damage to top of leaf.

Photographs can be a valuable diagnostic tool, but they have to be in focus, taken from various angles and come with details on field conditions and location.

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SEE THE AGRABOT DEMO AT CANOLAPALOOZA ALBERTA

At Alberta canolaPALOOZA, June 27 at Lacombe, farmer Brian Tischler will demonstrate his AgraBot. The DIY autonomous tractor uses free and open source software called AgOpenGPS. At canolaPALOOZA, Tischler will show how to set up a field and then send the tractor to complete the field on its own.

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COMING EVENTS

Canola coming events. Mark your calendar. Register. Learn.

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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

NPARA Morning Crop Walk

Join NPARA for a look at a variety of plots including canola variety trials
Aug 15
Northstar, AB
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