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Derek's Notes



Flea Beetle Scouting in Canola

 

flea beetle

~ This week’s blog is brought to you by Dwight Willoughby, P.Ag, CCSC

 

Seed Treatments for canola help protect seedlings from disease and flea beetle damage.  Factors that reduce canola growth rate and add stress can make canola more vulnerable to these pests.  The key is to start with a plant stand of 7 to 10 plants per square foot.    Assess the stand at emergence; if the population is low the same flea beetles can cause more damage per plant, so adjust your actions accordingly.

Image / chart from canolawatch.org

Image / chart from canolawatch.org

 

 

Early scouting and continue regularly to the 4 leaf stage to monitor feeding, plant health and plant count.  Flea beetles are more active in warm, dry, windy conditions.  To assess damage to flea beetles, click the link below for more information, or use the image to the right from canolawatch.org

 

Flea Beetle Damage Ratings

*Image source, Canola Watch.

Managing Rotations and Weed Resistance in Corn

~ This week’s blog is brought to you by Dwight Willoughby  P.Ag, CCSC

corn

In our farming area we have been long aware of resistant weeds.  In RR corn, glyphosate is the foundation of your weed control but, it should not be relied upon to do all the heavy lifting.  We know what the consequences would be of losing such a valuable herbicide to resistance and we need to manage to avoid that.  A few years ago, popular wisdom was to just rotate different modes of action with our crop rotations to delay the onset of resistance.  Today, with the ever expanding RR crops and acres, weed scientists now recommend an integrated approach of rotating modes of action and employing tank mix options with different modes of action with our corn rotations.

kochia

Kochia

Recently, research has indicated that tank-mixes are potentially more effective then rotation in delaying the development of herbicide resistance.  What’s important to note is to be prudent and chose tank mix partners from 2 different modes of action groups that overlap on the target weed in question.

 

Fleabane

Fleabane

 

The Western Canadian experience of glyphosate resistance weeds is relatively new, but we need to be scouting for weeds that have a history of glyphosate resistance in neighbouring provinces and states such as; kochia, fleabane, volunteer canola, Russian thistle, tall waterhemp, common and giant ragweed plus annual sow thistle.

Suggested Tank Mixes

Pre-seed and Pre-ground crack burn-off

Mode of Action         Weeds

Heat LQ                         14   –   Kochia, giant ragweed, common ragweed, annual sow thistle, Russian thistle, volunteer canola.

Armezon                        26 –  Giant ragweed, kochia, suppression of common ragweed, volunteer canola

Basagran                         6 – Volunteer canola, suppression of kochia

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