Canola Watch #20

August 6, 2015

AUGUST 6 QUIZ — GREEN WORMS

Quiz 2 (Mike Dolinski)

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TRY THIS HANDY TOOL: SPRAYTOSWATH.CA

spraytoswathscreenshots

The quick and easy pre-harvest interval tool — the — helps you find a fungicide, insecticide or pre-harvest herbicide that fits your timeframe available.

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LYGUS NYMPHS: WHICH ONES DO YOU COUNT?

Don't count these tiny ones without the black dots. This photo was taken on a lined notepad to show the size. Source: Justine Cornelsen

When doing lygus counts, include adults and late instar nymphs. Nymphs are young lygus, and only the larger nymphs do enough damage to be included in sweep net counts. A key feature is the black dots on the back. Count nymphs with dots. Don’t count them if they’re small and don’t have the dots (like the one above).

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BEGIN YOUR PRE-HARVEST DISEASE WATCH

When ground-truthing this image taken with the CCC drone, agronomist found about 10-15% of plants infected with sclerotinia stem rot. Photo credit: Amanda Wuchner

Three major stem diseases — blackleg, clubroot and sclerotinia stem rot — are more easily identified in the weeks leading up to harvest. Areas of the field with prematurely ripening plants and excessive lodging are signs that any one of these three diseases could be present.

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FIVE STEPS TO PREP FOR LOWER LOSSES THIS HARVEST

1. When you pull out the combine to get it ready for the season, look it over for holes and cracks in the pickup, feederhouse, elevator, shoe seals, separator covers and the grain tank. Canola seed can dribble out these openings even before it reaches the back end…

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BOUGHT A USED COMBINE? CHECK IT FOR SOIL

Buying used equipment from a clubroot area can create an unexpected transfer of the disease. We heard this week of a grower from northern Alberta who bought a used combine from a known clubroot area. The grower was surprised at how much soil was on and inside the combine, and this soil very likely contained clubroot spores.

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SWATH TIMING FOR HIGHER YIELD

The optimal swath timing for canola yield and quality is when 60% of seeds on the main stem are showing some colour change. Seed colour change (SCC) is considered any amount of yellow or brown on the seed. This because side branches have longer to fill and average seed size for the whole plant is larger.

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STRAIGHT COMBINING CANOLA: REDUCING THE RISK

Straight combining

Growers who want to try straight combining for the first time, keep these risk scenarios in mind….

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PROACTIVE STEPS FOR A SAFE HARVEST

The following tips are from the SAFE Farms Harvest TIP sheet.

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COMING EVENTS

Canola Galla 2015 — August 19, Penhold, AB
Harvest timing and Palooza plot tour — August 19, Lacombe, AB
Canola Discovery Forum — October 27-28, Canmore, AB

Read more for registration links

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LATE SEASON HAIL: DAMAGED PODS AND SWATHING TIMING

Late season hail can damage pods and increase the shattering risk for those pods. Before jumping the gun and swathing too early, take these decision-making steps….

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DIAMONDBACK MOTH LARVAE THRESHOLDS

Thresholds are 100-150 larvae per square metre in immature to flowering plants and 200-300 larvae per square metre (20-30 per square foot) in plants with flowers and pods. While these nominal thresholds are based on dense stands of 150-200 plants per square metre, plant population is not a major factor. Fewer plants will have more branching and more pods, so the number of pods per square foot probably won’t change much regardless of plant population.

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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

2019 Powering Your Profits Tour

A day of canola agronomy, marketing management and more!
Nov 19 - Nov 28
12 locations across Alberta,

Peace Region Clubroot Response Workshop

The science, the agronomy, and the farmer experience of clubroot.
Feb 5
Grande Prairie, Alberta

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