Canola Watch – August 1, 2018

August 1, 2018

START YOUR PRE-HARVEST DISEASE SCOUTING

Diseases are usually easiest to see and diagnose in the couple of weeks before swath timing. Patches of dying or prematurely-ripening plants are obvious areas to scout (and show up really well with drone images), but even clean-looking fields can provide some early warning if you take time to look. Here’s how to identify the major diseases of canola as fields get close to swathing stage…

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CANOLA WATCH QUIZ – WORM ID

How are your worm ID skills? Take the quiz and try to identify the four worms – two familiar, two not so much.

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MAP OF THE WEEK – WEST NILE

The Prairie Pest Monitoring Network tracks Culex tarsalis, the mosquito that carries West Nile virus. The map shows the regions most advanced in degree-day accumulations for Culex tarsalis.

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WEBINAR: HOW TO USE OUR NEW COMBINE OPTIMIZATION TOOL

CCC agronomy specialists Angela Brackenreed and Shawn Senko and PAMI’s Nathan Gregg will present a Combine Optimization Tool webinar on Thursday, August 2 at 10:00am CDT (Manitoba time)

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SWATH TIMING FOR HIGHER YIELD

Seeds with just a touch of brown or yellow are considered "colour changed". Credit: Brent Wiebe

Optimal swath timing for canola yield and quality is when at least 60% of seeds on the main stem are showing some colour change and when most (or all) side-branch seeds are “firm to roll.”

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PRE-HARVEST PRODUCTS FOR USE IN CANOLA

What is the goal with a pre-harvest application? If weed control is the goal, assess the weed situation before spraying. If desiccation (crop and weed dry-down) is the goal for straight combining, this decision should wait until just before harvest. Here are the pre-harvest options for canola…

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THIN STANDS AND STRAIGHT COMBINING

Uniform well-knit canola crops are the best for straight combining, but what about thin and/or multi-stage canola? Both options have risks…

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FIND A PRODUCT’S PRE-HARVEST INTERVAL AT SPRAYTOSWATH.CA

Every crop protection product has its own pre-harvest interval (PHI) — which is the time required between spraying and cutting the crop. PHI is also often different for the same product used on different crops.

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LYGUS: SCOUTING, THRESHOLDS AND TIMING

Scout lygus at late flowering and podding stages using a standard insect net of 38 cm (15″) diameter. Take ten 180° sweeps, and aim to sweep the flowers and pods while moving forward. Count the number of lygus in the net.

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LATE-SEASON FLEA BEETLES

Flea beetles feeding on canola leaves and pods are unlikely to cause an economic loss. Entomologists have not set thresholds for late season flea beetle feeding, but it’s generally believed that numbers have to be very high — perhaps 100 per plant — before economic losses occur. You may also note that flea beetles can be highly variable at this time of year, with high numbers on some plants and next to none on others.

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REMINDER: COMPILE NOTES

In the weeks leading up to harvest, growers may have some times to review their notes, or finalize their notes, on the season so far. Accurate notes on seeding date, rate, fertilizer, weather, pest observations, crop stand, in-crop actions (dates, rates, products) and more will be invaluable for winter planning and management decisions in future years.

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OUR MOST-CLICKED ARTICLES OVER THE PAST WEEK

Manitoba: Three insects to look for on canola pods
Saskatchewan: Three insects to look for on canola pods
Alberta: Map of the Week – Days above 30°C

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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

You can subscribe to Canola Watch and search all the articles on the Canola Watch website

contact a Canola Council of Canada agronomy specialist

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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