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• • 2015 - Issue 19

  Insect update: Check to be sure

  July 29, 2015

  • Bertha armyworm
  • Diamondback moth
  • Grasshopper
  • Insects

  

  Diamondback moth larvae and grasshoppers have been reported, but so far nothing of widespread significance. The photo shows what grasshoppers can do to a canola plant, but their damage is usually isolated to small patches. Bertha armyworm adult traps are coming down with very little in the way of hotspots…

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• • 2015 - Issue 16

  Insect update: Grasshoppers, lygus, cabbage seedpod weevil

  July 2, 2015

  • Cabbage seedpod weevil
  • Grasshopper
  • Insects
  • Insects other
  • Lygus

  

  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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• • 2015 - Issue 14

  Insect update: Grasshopper, diamondback, lygus, CSPW

  June 17, 2015

  • Cabbage seedpod weevil
  • Diamondback moth
  • Grasshopper
  • Insects
  • Insects other
  • Lygus

  

  Grasshoppers. If populations are significant and crop feeding has begun, a spray or bait application around field edges may be enough to reduce the threat. Grasshoppers are easier to manage……

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• • 2013 - Issue 12

  Insect update: Cutworms, flea beetles, CSPW, grasshoppers

  June 19, 2013

  • Cabbage seedpod weevil
  • Cutworm
  • Flea beetle
  • Grasshopper
  • Insects

  

  Cutworms are spotty but keep scouting. Flea beetles may need to be controlled past the 4-leaf stage in some extreme cases this year. Cabbage seedpod weevil numbers are building but only spray after first flower and only if sweep net results show them at thresholds. Hold off on early grasshopper control…

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• • Flea beetle
  • 2011 - Issue 13

  Insect update

  June 22, 2011

  • Cabbage seedpod weevil
  • Flea beetle
  • Grasshopper
  • Insects
  • Insects other
  • Lygus

  Flea beetle spraying continues in Manitoba where crops are advancing slowly due to excess rain and limited warmth. Redbacked cutworms are still causing severe damage in southern Alberta. Some sprayed fields need to be reseeded…

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