Canola Watch – July 6, 2016

July 6, 2016

SCLEROTINIA: FACTORS THAT INCREASE AND REDUCE RISK

Factors that increase the sclerotinia risk, factors that reduce the risk, and situations where a second application may be warranted….

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SCLEROTINIA MANAGEMENT: COMMON QUESTIONS

Here are a few questions we often get on sclerotinia stem rot management. Answers and links may help with your management decisions.

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HOW TO COUNT 10%, 20% AND 50% FLOWER

Use these descriptions to identify key flowering stages for sclerotinia stem rot and cabbage seedpod weevil management.

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LOOK OUT FOR FOOT ROT: CONSIDER ROTATIONS

Foot rot. Credit: Justine Cornelsen

Rhizoctonia infection at the bolting and flowering stages of the season can cause roots to pinch off at the crown — which is right around ground level.

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INSECT UPDATE: LYGUS, BERTHA ARMYWORM, CSPW

Lygus bug adult on a pod.

The current situation for lygus, bertha armyworm, cabbage seedpod weevil, diamondback moth and swede midge.

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ID GREEN WORMS ACCURATELY

Before spraying, make sure your canola is at the right stage to be damaged by the worms and that the worms are actually the species you’re trying to control. Here’s how to tell the difference….

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HAIL ON FLOWERING CANOLA

Hail damage at mid to late flower can result in high yield losses. If trying a rescue treatment, check that there is leaf area to take up the treatment, and that the crop has any chance of recovery.

The later hail occurs in the season, the more damage it can do to yield. That said, flowering canola can, with enough time, recover from hail that knocks off a large percentage of flowers.

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WHAT HAPPENS WHEN FLOWERS BLOW OFF?

When a strong wind blows off a lot of canola flowers, the crop can recover fully by flowering longer.

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COMING EVENTS

Upcoming canola events…

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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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