Canola Watch #13

June 10, 2015

JUNE 10 QUIZ — CUTWORMS

How well can you identify the most common cutworm species found in Canadian canola crops?

Pale western cutworm (Frank Peairs-bugwood.org) small

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INSECT UPDATE: CUTWORMS, FLEA BEETLES, ASTER LEAFHOPPERS

Striped flea beetle on stem. Credit: Deanna McLennan

Flea beetles remain the single biggest insect threat this week, although pressure seems to be waning. Cutworm losses have been reported in a few fields across the Prairies, but damage is usually patchy within a field and nearby fields might not have any losses. The key with all insects is to scout and count and adhere to for control. Just seeing a few cutworms or grasshoppers or any other pest is not a reason to spray them. Photo credit: Deanna McLennan

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TOP 10 REASONS FOR PATCHY EMERGENCE — JUNE 2015

This photo has it all: A frost damaged seedling, flea beetle feeding on the survivor and clear evidence of dry soils. Credit: Amanda Wuchner

Many situations can lead to patchy canola emergence and growth patterns. Here are our top 10 for this year…

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HOT WEATHER CAN REDUCE INSECTICIDE PERFORMANCE

Under hot conditions the metabolism of (some) target insects is significantly faster. Control of the pest is more complete when the metabolism of the pest is slower which is generally associated with cooler or moderate temperatures. It is also known that control of some insect species with pyrethroid insecticides decreases as temperature rises. Some pests are also more available in cooler or moderate temperatures.

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WEEDS: WHEN WOULD A SECOND IN-CROP APPLICATION MAKE SENSE?



A second application of in-crop herbicide is not always economical if the crop is well established, competitive and ahead of the remaining weed population. A second application can make sense…

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GRASSY WEED CONTROL IN HT CANOLA

Some canola fields face intense competition from grassy weeds this year.

Grassy weeds are getting ahead of the canola in some fields. Timely weed control is essential.

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UCC 2015 WEBPAGE LAUNCH

The 2015 Ultimate Canola Challenge (UCC) is up and running, and now the UCC webpage is too! The intent of the UCC is to identify the best management strategies for growers by testing various techniques and products over and above the CCC recommended best management practices for canola. The new webpage provides information on this year’s product comparison, the small plot and field-scale protocols, the UCC data collection worksheet, the UCC introduction webinar and more!

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TWITTER: HOW TO JOIN THE CONVERSATION

Twitter is a quick and timely way to share agronomy information and photos, ask questions, and get useful links from a broad community of growers, agronomists and many others involved in agriculture in Canada and the world.

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HAIL DAMAGE: ECONOMIC LOSS DEPENDS ON CROP STAGE

The later that hail occurs, the more likely for yield loss, given that plants simply have less time to recover. Plants at the 6-leaf stage, for example, that lose most of the leaf area on the main stem can still live, but these leaves will not regrow. The plant will be delayed, and more of the yield potential — which will be lower than before the hail — will come from side branches.

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BLACKLEG: USE FUNGICIDE ONLY WHERE BLACKLEG IS A PROBLEM

If your crop history and crop scouting suggest high risk for blackleg, consider fungicide as an additional tool to limit infection and yield loss. Headline and Quadris are available for blackleg management in canola.

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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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