Insects

Canola Watch provides timely answers to top canola agronomy questions on diseases, insects, weeds and so much more.
Featured image for “Insect update: Late flea beetle questions”
September 5, 2013

Insect update: Late flea beetle questions

Growers are still seeing some insects in their canola crops, including a higher than normal presence of flea beetles. Answers to the following three
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Featured image for “Late canola faces higher bertha armyworm risk”
August 28, 2013

Late canola faces higher bertha armyworm risk

Bertha armyworm got its name because the worms will march like an army in search of food. As canola crops dry down and are
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Featured image for “Late-season flea beetles”
August 28, 2013

Late-season flea beetles

Flea beetle numbers this late in the season are higher than we’ve seen in years, which could point to higher numbers next spring. For
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Featured image for “Insect update: Big berthas, weevil larvae, lygus”
August 21, 2013

Insect update: Big berthas, weevil larvae, lygus

Bertha armyworms keep eating to within a few days of pupating. These 1.5” late-stage berthas eat much more than at smaller stages, doing a
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Featured image for “Pre-harvest intervals (PHIs) for insecticides”
August 21, 2013

Pre-harvest intervals (PHIs) for insecticides

Many canola fields are within 5 to 10 days of swathing, which limits the choices for insecticides — based on pre-harvest intervals. Here are
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Featured image for “Why are there blanks instead of pods?”
August 14, 2013

Why are there blanks instead of pods?

Again this year, canola crops with blanks or missing pods on the main stem are being found. Typically, a missing pod can result from
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Featured image for “Bertha armyworm on the move soon”
August 14, 2013

Bertha armyworm on the move soon

Bertha armyworm spraying has been reported in a few fields. Scout lower in the canopy this week, looking for larvae feeding on lower leaves.
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Featured image for “Read and follow pre-harvest intervals (PHIs)”
August 14, 2013

Read and follow pre-harvest intervals (PHIs)

Pre-harvest interval (PHI) refers to the amount of time that must lapse (in days) after a pesticide application before the crop is cut (ie.
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Featured image for “What is the “economic” threshold for lygus?”
August 14, 2013

What is the “economic” threshold for lygus?

  Lygus counts are very high in some locations, but get out the sweep net and scout to be sure. If canola is $12
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Featured image for “Bertha armyworms work their way up”
August 8, 2013

Bertha armyworms work their way up

Bertha armyworm spraying has been reported in a few fields. Scout lower in the canopy this week, looking for feeding on lower leaves. Spotting
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Featured image for “Why the missing pods?”
July 31, 2013

Why the missing pods?

Some canola fields are exhibiting missing or stunted pods at the top or middle of stems. Pods in some fields have been described as
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Featured image for “Diamondback moth larvae scouting and thresholds”
July 31, 2013

Diamondback moth larvae scouting and thresholds

Diamondback moth larvae are showing up in canola fields. The most accurate method to estimate diamondback moth population density is to count larvae in
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