Canola Watch #16

July 2, 2015

JULY 2 QUIZ – FLOWERS

Quiz 2

What has damaged these flowers…?

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NO CAUSE IDENTIFIED FOR MYSTERY SYMPTOMS

Mystery symptoms 6. Credit: Gregory Sekulic

Under various conditions the past decade, some canola fields have exhibited stunting and strange deformities in bud clusters — as demonstrated in the photo gallery in this article. The cause remains a mystery.

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INSECT UPDATE: GRASSHOPPERS, LYGUS, CABBAGE SEEDPOD WEEVIL

grasshopper feeding small

Grasshoppers may be above thresholds in some fields. The nominal threshold for grasshoppers in canola is 8-12 per square metre, although the higher end of that range may be more appropriate in a typical canola crop. Grasshoppers are often at higher numbers at field margins, making a targeted spray possible. Scout to see where that line is.

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HEAT AND DROUGHT CAN CAUSE FLOWER ABORTION

All parts of the Prairies had at least one day with a high of at least 28°C over the past week. Some areas were much hotter for days in a row.

Hot days (28-30°C and up) and warm nights (16°C and up) from bud to mid-flowering stages can have a devastating effect on canola yield.

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SPRAYING A MULTI-STAGED CROP

Many canola crops have plants at multiple stages of growth. This field was reseeded due to frost, but some of the originals survived.

Crop staging comes into play for herbicide, insecticide and fungicide timing. So crops with plants at various stages — some at flowering, some barely at the bud stage, for example — present a challenge when deciding when to spray.

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SCLEROTINIA RISK: HOW LOW IS IT?

This shows general sclerotinia stem rot incidence across Saskatchewan along with a general description of the moisture situation. There can still be pockets of higher incidence in years when most of the province is dry. Source: Saskatchewan Ministry of Agriculture

Moisture is the key risk factor for sclerotinia stem rot. Without moisture before, 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. Moisture can come as rain, dew and/or humidity above 80%.

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10%, 20% AND 50% FLOWER

Canola at 20% flower. Source: NDSU

Sclerotinia stem rot and cabbage seedpod weevil control timing depends on flowering stage. This article will help you estimate 10%, 20% and 50% flower.

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CANOLA RESEARCH HUB — VIDEO TUTORIAL

A for the is up and running. The video gives a quick introduction to the site and how to use it. Research is continually being added to the hub. Take some time and check out its features.

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COMING EVENTS

International Rapeseed Congress – July 5-9, Saskatoon, SK
Crop diagnostic school — July 7-9 and 14-17, Carman, MB
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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HAIL AT FLOWERING

Canola is quite resilient to light hail at up to 20% flower. The crop can flower longer to compensate, and may recover with only minimal to moderate yield loss. Canola has also shown remarkable recovery from more intense hail at 20% flower. However, a crop flattened by hail is unlikely to recover. If regrowth occurs, which is possible, plants are set back so far that maturity becomes a major factor.

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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

Farming Smarter Conference

Two days – challenging topics – open discussion
Dec 11 - Dec 12
Lethbridge, Alberta

Peace Region Clubroot Response Workshop

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

Making The Grade

Hands on Grain grading course designed for farmers
Feb 19
Grande Prarie, Alberta

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