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  • Archives

    •  2019 (225 articles)
      •  Dec (10 articles)
        • December 4, 2019 - Issue 30
      •  Oct (20 articles)
        • October 30, 2019 - Issue 29
        • October 9, 2019 - Issue 28
        • October 2, 2019 – Issue 27
      •  Sep (35 articles)
        • September 25, 2019 – Issue 26
        • September 18, 2019 – Issue 25
        • September 11, 2019 - Issue 24
        • September 5, 2019 - Issue 23
      •  Aug (31 articles)
        • August 28, 2019 – Issue 22
        • August 21, 2019 – Issue 21
        • August 14, 2019 – Issue 20
        • August 8, 2019 - Issue 19
      •  Jul (34 articles)
        • July 31, 2019 - Issue 18
        • August 8, 2019 - Issue 19
        • July 25, 2019 – Issue 17
        • July 17, 2019 - Issue 16
        • July 10, 2019 - Issue 15
        • July 4, 2019 – Issue 14
      •  Jun (26 articles)
        • June 27, 2019 – Issue 13
        • July 17, 2019 - Issue 16
        • July 4, 2019 – Issue 14
        • June 19, 2019 - Issue 12
        • June 13, 2019 - Issue 11
        • June 5, 2019 - Issue 10
        • Uncategorized
      •  May (33 articles)
        • July 4, 2019 – Issue 14
        • May 29, 2019 - Issue 9
        • May 22, 2019 - Issue 8
        • June 13, 2019 - Issue 11
        • June 19, 2019 - Issue 12
        • June 5, 2019 - Issue 10
        • May 15, 2019 - Issue 7
        • May 1, 2019 – Issue 5
        • December 4, 2019 - Issue 30
        • May 8, 2019 - Issue 6
      •  Apr (6 articles)
        • April 4, 2019 - Issue 4
      •  Mar (8 articles)
        • April 4, 2019 - Issue 4
        • March 1, 2019 – Issue 3
      •  Feb (12 articles)
        • April 4, 2019 - Issue 4
        • February 8, 2019 – Issue 2
        • March 1, 2019 – Issue 3
      •  Jan (10 articles)
        • January 10, 2019 - Issue 1
        • February 8, 2019 – Issue 2
    •  2018 (304 articles)
      •  Dec (7 articles)
        • December 6, 2018 – Issue 29
      •  Nov (10 articles)
        • November 7, 2018 – Issue 28
      •  Oct (11 articles)
        • November 7, 2018 – Issue 28
        • October 11, 2018 – Issue 27
        • September 26, 2018 – Issue 26
      •  Sep (46 articles)
        • September 26, 2018 – Issue 26
        • September 19, 2018 - Issue 25
        • September 12, 2018 – Issue 24
        • September 6, 2018 – Issue 23
      •  Aug (52 articles)
        • August 29, 2018 - Issue 22
        • August 22, 2018 - Issue 21
        • August 15, 2018 - Issue 20
        • August 9, 2018 – Issue 19
        • August 1, 2018 – Issue 18
      •  Jul (38 articles)
        • July 26, 2018 – Issue 17
        • July 18, 2018 – Issue 16
        • July 11, 2018 - Issue 15
        • July 5, 2018 – Issue 14
      •  Jun (43 articles)
        • June 27, 2018 – Issue 13
        • July 18, 2018 – Issue 16
        • June 20, 2018 – Issue 12
        • June 13, 2018 – Issue 11
        • June 6, 2018 – Issue 10
      •  May (54 articles)
        • May 30, 2018 - Issue 9
        • May 24, 2018 – Issue 8
        • May 16, 2018 - Issue 7
        • May 9, 2018 - Issue 6
        • May 2, 2018 - Issue 5
      •  Apr (12 articles)
        • Uncategorized
        • April 4, 2018 - Issue 4
      •  Mar (10 articles)
        • March 2, 2018 - Issue 3
      •  Feb (11 articles)
        • February 7, 2018 - Issue 2
      •  Jan (10 articles)
        • March 2, 2018 - Issue 3
        • January 17, 2018 - Issue 1
    •  2017 (255 articles)
      •  Dec (2 articles)
        • December 5, 2017 - Issue 30
      •  Nov (8 articles)
        • November 8, 2017 - Issue 29
      •  Oct (10 articles)
        • October 4, 2017 - Issue 28
      •  Sep (38 articles)
        • September 27, 2017 - Issue 27
        • September 20, 2017 - Issue 26
        • September 13, 2017 - Issue 25
        • September 7, 2017 - Issue 24
        • October 4, 2017 - Issue 28
      •  Aug (41 articles)
        • August 30, 2017 - Issue 23
        • August 23, 2017 - Issue 22
        • August 16, 2017 - Issue 21
        • August 10, 2017 - Issue 20
        • August 2, 2017 - Issue 19
      •  Jul (30 articles)
        • July 26, 2017 - Issue 18
        • July 19, 2017 - Issue 17
        • July 12, 2017 - Issue 16
        • July 6, 2017 - Issue 15
      •  Jun (29 articles)
        • June 28, 2017 - Issue 14
        • June 22, 2017 - Issue 13
        • June 14, 2017 - Issue 12
        • June 7, 2017 - Issue 11
      •  May (54 articles)
        • May 31, 2017 - Issue 10
        • May 25, 2017 - Issue 9
        • June 7, 2017 - Issue 11
        • May 17, 2017 - Issue 8
        • May 10, 2017 - Issue 7
        • May 3, 2017 - Issue 6
      •  Apr (14 articles)
        • April 26, 2017 - Issue 5
        • April 5, 2017 - Issue 4
      •  Mar (10 articles)
        • March 2, 2017 - Issue 3
      •  Feb (12 articles)
        • February 8, 2017 - Issue 2
        • Canola Digest
      •  Jan (7 articles)
        • Canola Digest
        • January 2017
        • January 13, 2017 - Issue 1
    •  2016 (268 articles)
      •  Dec (6 articles)
        • December 9, 2016 - Issue 30
      •  Nov (14 articles)
        • November 9, 2016 - Issue 29
      •  Oct (10 articles)
        • October 13, 2016 - Issue 28
        • November 9, 2016 - Issue 29
      •  Sep (24 articles)
        • September 28, 2016 - Issue 27
        • September 14, 2016 - Issue 26
        • January 13, 2017 - Issue 1
        • September 8, 2016 - Issue 25
      •  Aug (45 articles)
        • August 31, 2016 - Issue 24
        • Uncategorized
        • August 24, 2016 - Issue 23
        • August 17, 2016 - Issue 22
        • August 10, 2016 - Issue 21
        • August 4, 2016 - Issue 20
      •  Jul (31 articles)
        • July 27, 2016 - Issue 19
        • July 20, 2016 - Issue 18
        • July 13, 2016 - Issue 17
        • July 6, 2016 - Issue 16
      •  Jun (48 articles)
        • June 30, 2016 - Issue 15
        • June 23, 2016 - Issue 14
        • June 15, 2016 - Issue 13
        • June 8, 2016 - Issue 12
        • June 1, 2016 - Issue 11
      •  May (36 articles)
        • May 26, 2016 - Issue 10
        • May 18, 2016 - Issue 9
        • August 24, 2016 - Issue 23
        • May 11, 2016 - Issue 8
        • May 4, 2016 - Issue 7
      •  Apr (26 articles)
        • April 27, 2016 - Issue 6
        • April 13, 2016 - Issue 5
        • April 6, 2016 - Issue 4
      •  Mar (13 articles)
        • March 17, 2016 - Issue 3
      •  Feb (6 articles)
        • March 17, 2016 - Issue 3
        • February 3, 2016 - Issue 2
        • April 6, 2016 - Issue 4
      •  Jan (9 articles)
        • January 6, 2016 - Issue 1
        • February 3, 2016 - Issue 2
    •  2015 (240 articles)
      •  Dec (14 articles)
        • December 2, 2015 - Issue 30
        • January 6, 2016 - Issue 1
      •  Nov (12 articles)
        • November 4, 2015 - Issue 29
      •  Oct (6 articles)
        • October 7, 2015 - Issue 28
      •  Sep (23 articles)
        • October 7, 2015 - Issue 28
        • September 23, 2015 - Issue 27
        • September 16, 2015 - Issue 26
        • September 10, 2015 — Issue 25
        • September 2, 2015 - Issue 24
      •  Aug (35 articles)
        • August 26, 2015 - Issue 23
        • October 7, 2015 - Issue 28
        • September 2, 2015 - Issue 24
        • Ultimate Canola Challenge - Updates
        • August 19, 2015 - Issue 22
        • August 12, 2015 - Issue 21
        • April 6, 2016 - Issue 4
        • August 6, 2015 - Issue 20
      •  Jul (33 articles)
        • July 29, 2015 - Issue 19
        • Ultimate Canola Challenge - Updates
        • July 22, 2015 - Issue 18
        • July 15, 2015 - Issue 17
        • July 2, 2015 - Issue 16
      •  Jun (32 articles)
        • June 26, 2015 - Issue 15
        • June 17, 2015 - Issue 14
        • Ultimate Canola Challenge - Updates
        • June 10, 2015 - Issue 13
        • June 3, 2015 - Issue 12
        • August 6, 2015 - Issue 20
      •  May (26 articles)
        • June 3, 2015 - Issue 12
        • May 28, 2015 - Issue 11
        • May 21, 2015 - Issue 10
        • May 6, 2015 - Issue 8
        • June 11, 2014 - Issue 10
        • May 13, 2015 - Issue 9
        • May 15, 2013 - Issue 7
        • March 11, 2015 - Issue 4
      •  Apr (28 articles)
        • April 29, 2015 - issue 7
        • April 22, 2015 - Issue 6
        • April 2, 2015 - Issue 5
        • April 6, 2016 - Issue 4
      •  Mar (10 articles)
        • March 11, 2015 - Issue 4
        • Clubroot
      •  Feb (10 articles)
        • February 4, 2015 - Issue 3
        • Clubroot
      •  Jan (11 articles)
        • January 7, 2015 - Issue 2
        • February 4, 2015 - Issue 3
        • January 6, 2015 - Issue 1
    •  2014 (274 articles)
      •  Dec (11 articles)
        • December 10, 2014 - Issue 29
        • Harvest and Storage
        • Blackleg
        • Clubroot
      •  Nov (14 articles)
        • November 28, 2014 - Alert 3
        • November 4, 2015 - Issue 29
        • November 5, 2014 - Issue 28
        • Harvest and Storage
        • December 10, 2014 - Issue 29
      •  Oct (12 articles)
        • October 8, 2014 - Issue 27
        • Harvest and Storage
        • October 7, 2015 - Issue 28
        • Clubroot
        • October 1, 2014 - Issue 26
      •  Sep (45 articles)
        • September 24, 2014 - Issue 25
        • Harvest and Storage
        • September 10, 2015 — Issue 25
        • Blackleg
        • September 17, 2014 - Issue 24
        • Clubroot
        • September 10, 2014 - Issue 23
        • September 23, 2015 - Issue 27
        • September 8, 2014 - Alert 2
        • September 4, 2014 - Issue 22
        • October 7, 2015 - Issue 28
      •  Aug (41 articles)
        • August 27, 2014 - Issue 21
        • September 14, 2016 - Issue 26
        • September 8, 2016 - Issue 25
        • Harvest and Storage
        • August 20, 2014 - Issue 20
        • Blackleg
        • Clubroot
        • August 13, 2014 - Issue 19
        • Harvest management
        • Hail
        • August 7, 2014 - Issue 18
        • August 6, 2015 - Issue 20
      •  Jul (48 articles)
        • July 30, 2014 - Issue 17
        • July 29, 2015 - Issue 19
        • August 6, 2015 - Issue 20
        • July 23, 2014 - Issue 16
        • July 16, 2014 - Issue 15
        • Plant establishment general/other
        • July 15, 2015 - Issue 17
        • July 9, 2014 - Issue 14
        • July 3, 2014 - Issue 13
        • June 26, 2015 - Issue 15
        • August 7, 2014 - Issue 18
      •  Jun (43 articles)
        • June 25, 2014 - Issue 12
        • June 26, 2015 - Issue 15
        • Hail
        • June 18, 2014 - Issue 11
        • Clubroot
        • Flea beetle
        • Harvest and Storage
        • June 10, 2015 - Issue 13
        • May 28, 2015 - Issue 11
        • June 11, 2014 - Issue 10
        • June 4, 2014 - Issue 9
      •  May (32 articles)
        • May 28, 2014 - Issue 8
        • May 22, 2014 - Issue 7
        • June 3, 2015 - Issue 12
        • May 14, 2014 - Issue 6
        • Uncategorized
        • May 7, 2014 - Issue 5
      •  Apr (9 articles)
        • April 24, 2014 - Alert 1
        • April 3, 2014 - Issue 4
      •  Mar (4 articles)
        • March 5, 2014 - Issue 3
      •  Feb (6 articles)
        • February 4, 2014 - Issue 2
        • July 29, 2015 - Issue 19
      •  Jan (9 articles)
        • January 9, 2014 - Issue 1
        • February 3, 2016 - Issue 2
    •  2013 (258 articles)
      •  Dec (13 articles)
        • December 18, 2013 - Issue 30
        • December 11, 2013 - Issue 29
        • December 11, 2013 - CCA/CCSC exam
      •  Nov (5 articles)
        • November 6, 2013 - Issue 28
        • Clubroot
      •  Oct (7 articles)
        • October 2, 2013 - Issue 27
        • October 7, 2015 - Issue 28
      •  Sep (32 articles)
        • September 25, 2013 - Issue 26
        • Clubroot
        • Harvest and Storage
        • September 18, 2013 - Issue 25
        • September 2, 2015 - Issue 24
        • Harvest
        • September 11, 2013 - Issue 24
        • September 5, 2013 - Issue 23
        • Flea beetle
      •  Aug (39 articles)
        • August 28, 2013 - Issue 22
        • Flea beetle
        • August 21, 2013 - Issue 21
        • July 29, 2015 - Issue 19
        • August 14, 2013 - Issue 20
        • August 8, 2013 - Issue 19
      •  Jul (37 articles)
        • July 31, 2013 - Issue 18
        • Flowering
        • July 24, 2013 - Issue 17
        • July 17, 2013 - Issue 16
        • July 10, 2013 - Issue 15
        • July 2, 2015 - Issue 16
        • July 4, 2013 - Issue 14
        • July 15, 2015 - Issue 17
        • July 1, 2013 - alert 2
      •  Jun (40 articles)
        • June 26, 2013 - Issue 13
        • Clubroot
        • June 19, 2013 - Issue 12
        • Hail
        • July 24, 2013 - Issue 17
        • June 12, 2013 - Issue 11
        • June 10, 2015 - Issue 13
        • June 5, 2013 - Issue 10
        • June 3, 2013 - Alert 1
      •  May (49 articles)
        • May 29, 2013 - Issue 9
        • May 23, 2013 - Issue 8
        • May 28, 2015 - Issue 11
        • May 15, 2013 - Issue 7
        • June 5, 2013 - Issue 10
        • June 26, 2013 - Issue 13
        • Uncategorized
        • Clubroot
        • May 8, 2013 - Issue 6
        • May 1, 2013 - Issue 5
      •  Apr (9 articles)
        • April 4, 2013 - Issue 4
      •  Mar (8 articles)
        • March 6, 2013 - Issue 3
      •  Feb (9 articles)
        • Uncategorized
        • February 7, 2013 - Issue 2
        • Blackleg
      •  Jan (10 articles)
        • November 7, 2018 – Issue 28
        • January 9, 2013 - Issue 1
    •  2012 (241 articles)
      •  Dec (8 articles)
        • December 19, 2012 - Issue 34
        • Uncategorized
        • December 5, 2012 - Issue 33
      •  Nov (4 articles)
        • November 7, 2012 - Issue 32
      •  Oct (6 articles)
        • October 3, 2012 - Issue 31
      •  Sep (23 articles)
        • September 28, 2012 - Media release
        • September 26, 2012 - Issue 30
        • September 12, 2012 - Issue 29
        • September 16, 2015 - Issue 26
        • September 6, 2012 - Issue 28
      •  Aug (38 articles)
        • August 29, 2012 - Issue 27
        • August 26, 2015 - Issue 23
        • Harvest
        • August 24, 2012 - Alert 3
        • August 22, 2012 - Issue 26
        • August 15, 2012 - Issue 25
        • August 9, 2012 - Issue 24
        • August 1, 2012 - Issue 23
      •  Jul (38 articles)
        • July 25, 2012 - Issue 22
        • July 18, 2012 - Issue 21
        • Flowering
        • Harvest
        • July 11, 2012 - Issue 20
        • Hail
        • Insects leafhopper
        • Blackleg
        • July 5, 2012 - Issue 19
      •  Jun (39 articles)
        • June 27, 2012 - Issue 18
        • Hail
        • June 20, 2012 - Issue 17
        • Flea beetle
        • June 13, 2012 - Issue 16
        • Blackleg
        • June 8, 2012 - Alert 2
        • June 6, 2012 - Issue 15
        • June 12, 2013 - Issue 11
      •  May (49 articles)
        • Uncategorized
        • May 31, 2012 - Issue 14
        • Flea beetle
        • May 24, 2012 - Issue 13
        • May 16, 2012 - Issue 12
        • May 14, 2012 - Alert 1
        • May 9, 2012 - Issue 11
        • May 2, 2012 - Issue 10
        • Clubroot
      •  Apr (17 articles)
        • April 25, 2012 - Issue 9
        • Flea beetle
        • April 4, 2012 - Issue 8
        • Clubroot
      •  Mar (8 articles)
        • March 9, 2012 - Issue 7
      •  Feb (9 articles)
        • Feb. 17, 2012 - Issue 6
        • Feb. 9, 2012 — Issue 5
        • March 17, 2016 - Issue 3
      •  Jan (2 articles)
        • Uncategorized
        • Jan. 27, 2012 - Issue 3
    •  2011 (284 articles)
      •  Dec (15 articles)
        • Jan. 4, 2012 - Issue 1
        • Dec.22, 2011 - Issue 30
        • Dec.13, 2011 - Issue 29
        • Dec.8, 2011 - Issue 28
      •  Nov (8 articles)
        • Nov. 2, 2011 - Issue 27
      •  Oct (10 articles)
        • Oct. 5, 2011 — Issue 26
        • Green canola
        • Harvest
      •  Sep (26 articles)
        • Uncategorized
        • Sept. 21, 2011 - Issue 25
        • Harvest
        • Green canola
        • Sept. 14, 2011 - Issue 24
        • Sept.14, 2011 - Alert 4
        • Sept. 8, 2011 - Issue 23
        • Sept. 2, 2011 - Alert 3
      •  Aug (59 articles)
        • August 31, 2011 - Issue 22
        • Harvest
        • August 24 2011 - Issue 21
        • Hail
        • Green canola
        • August 17, 2011 Issue 20
        • August 10, 2011 - Issue 19
        • Blackleg
        • Uncategorized
        • August 4, 2011 - Issue 18
        • August 26, 2015 - Issue 23
        • September 2, 2015 - Issue 24
      •  Jul (21 articles)
        • July 20, 2011 - Issue 17
        • Harvest
        • July 13, 2011 - Issue 16
        • July 6, 2011 - Issue 15
      •  Jun (49 articles)
        • June 29, 2011 - Issue 14
        • Uncategorized
        • June 22, 2011 - Issue 13
        • Flea beetle
        • June 15, 2011 - Issue 12
        • June 3, 2015 - Issue 12
        • June 8, 2011 - Issue 11
        • June 1, 2011 - Issue 10
      •  May (55 articles)
        • May 30, 2011 - Alert 1
        • May 25, 2011 - Issue 9
        • Uncategorized
        • May 18, 2011 - Issue 8
        • Flea beetle
        • May 11, 2011 - Issue 7
        • Plant establishment general/other
        • May 4, 2011 - Issue 6
        • Harvest
        • May 2, 2012 - Issue 10
        • October 8, 2014 - Issue 27
      •  Apr (12 articles)
        • Uncategorized
        • June 30, 2016 - Issue 15
        • Apr 7 2011 - Issue 5
      •  Mar (9 articles)
        • Mar 9 2011 - Issue 4
      •  Feb (9 articles)
        • Feb 17 2011 - Alert 1
        • Feb 7 2011 - Issue 3
      •  Jan (11 articles)
        • Jan 19 2011 - Issue 2
        • Uncategorized
        • Jan 5 2011 - Issue 1
    •  2010 (156 articles)
      •  Nov (7 articles)
        • 2010 – Issue 24
      •  Oct (4 articles)
        • 2010 – Issue 23
        • 2010 – Issue 22
      •  Sep (14 articles)
        • 2010 – Issue 21
        • Harvest
        • 2010 – Alert 3
        • 2010 – Alert 2
        • 2010 - Alert 1
        • 2010 - Issue 20
        • 2010 - Issue 19
      •  Aug (28 articles)
        • 2010 - Issue 18
        • Harvest
        • 2010 - Issue 17
        • 2010 - Issue 16
        • 2010 - Issue 15
      •  Jul (25 articles)
        • 2010 - Issue 14
        • Harvest
        • 2010 - Issue 13
        • 2010 - Issue 12
        • 2010 - Issue 11
      •  Jun (44 articles)
        • 2010 - Issue 10
        • 2010 - Issue 9
        • 2010 - Issue 8
        • 2010 - Issue 7
        • 2010 - Issue 6
        • 2009 - Issue 6
        • 2010 - Issue 5
        • Harvest
      •  May (34 articles)
        • 2010 - Issue 4
        • Flea beetle
        • 2010 - Issue 3
        • 2010 - Issue 2
        • 2009 - Issue 2
        • 2010 - Issue 1
        • Plant establishment general/other
    •  2009 (210 articles)
      •  Sep (32 articles)
        • 2009 – Issue 20
        • 2009 – Issue 19
        • 2009 – Issue 18
      •  Aug (40 articles)
        • 2009 – Issue 17
        • 2009 – Issue 16
        • 2009 – Issue 15
        • 2009 – Issue 14
      •  Jul (44 articles)
        • 2009 – Issue 13
        • 2009 – Issue 12
        • 2009 – Issue 11
        • 2009 - Issue 10
        • 2009 - Issue 9
      •  Jun (65 articles)
        • 2009 - Issue 8
        • 2009 - Issue 7
        • Flea beetle
        • Plant establishment general/other
        • 2009 - Issue 6
        • 2009 - Issue 5
        • 2009 - Issue 4
        • Harvest
      •  May (29 articles)
        • 2009 - Issue 3
        • 2009 - Issue 2
        • 2009 - Issue 1
  • Issues Archive

    Use the expandable navigational menu on the left hand column to find a specific issue of Canola Watch by year, month and date.


    July 31, 2013




    Issues of the week

    Blackleg lesion on stem, found on a canola plant in late July.

    Swathing will likely start within a week or 2 for earliest canola fields. Keep in mind that the ideal time to swath is around 60% seed colour change (SCC). Some fields will have to be cut earlier for growers with a lot of canola to get down, but try to avoid cutting before 30% SCC.

    See this week’s top 10 list for diseases to look for ahead of swathing. The days leading up to swathing are an excellent time to identify diseases present. Once diseases are identified, growers can augment management practices to reduce specific diseases in subsequent years.

    Insect monitoring continues this week, with diamondback moth larvae, bertha armyworms and grasshoppers the most important.

    Tweet of the week:

    Tweet of week July 31

    READ MORE







    Canola Watch quiz

    July 31 Quiz

    What caused these lesions?

    READ MORE







    Top 10 diseases to look for in August

    They are:
    10. White rust
    9. Fusarium wilt
    8. Grey stem
    7. Alternaria black spot
    6. Downy mildew
    5. Root rot and foot rot
    4. Aster yellows
    3. Clubroot
    2. Sclerotinia stem rot
    1. Blackleg

    READ MORE







    Why the missing pods?

    Missing or stunted pods at the top of this plant are likely due to heat stress. The plants look fine otherwise.

    Some canola fields are exhibiting missing or stunted pods at the top or middle of stems. Pods in some fields have been described as green on the ends and translucent in the middle. The most likely cause is environmental. The few days above 30°C in early July would certainly cause flower abortion, and the hormone response to a couple days of heat could stretch the effect on podding to a week or more. However, other factors can be at play…

    READ MORE







    Diamondback moth larvae scouting and thresholds

    Diamondback moth larvae. Notice the spindle shape — wider in the middle than at the ends. Source: Saskatchewan Ministry of Agriculture.

    Diamondback moth larvae are showing up in canola fields. The most accurate method to estimate diamondback moth population density is to count larvae in several locations throughout the field, and determine the average population per unit area.

    READ MORE







    Take a look for Swede midge damage

    Swede midge larvae feeding at the bud can stop stem elongation and leave pods in a cluster. Source: Owen Olfert

    Swede midge damage has been confirmed in canola fields in northeast Saskatchewan. The insect is not a major threat to canola in Western Canada, but it often causes extensive damage in Ontario. Entomologists want to keep on top of the insect in Western Canada, and would be interested to hear from you if you spot potential Swede midge damage.

    READ MORE







    Ideal swath timing is 60% seed colour change

    swathing canola

    Delaying swathing while you wait for more plants to mature is generally positive for yield, especially at this stage of the season.

    READ MORE




    July 24, 2013




    Issues of the week

    bertha armyworm mixed small

    Insect scouting is the top priority as canola moves out of flowering and into podding. Protection from insects, using economic thresholds, is most important at this stage as canola no longer has the capacity to compensate for losses. The photo above shows the various colours of bertha armyworm.

    While scouting for insects, take a look at plants for early signs of blackleg, clubroot and sclerotinia stem rot. Nothing can be done to mitigate losses at this stage, but identifying which diseases are present is relatively easy between now and harvest. Scouting now provides the opportunity — if diseases are present — to modify management plans in subsequent years.

    If you start to see problems show up, be wary of product claims such as, “If you had sprayed our product in June you wouldn’t be seeing that right now.” Get a few opinions, if necessary, to accurately identify problems. Try the Canola Diagnostic Tool at www.canoladiagnostictool.ca. Keep notes. And prepare to use proven remedies next year.

    A few noteworthy events are coming up: Disease Scouting Clinic in Portage la Prairie, Manitoba July 30; Crop Diagnostic School in Indian Head, Saskatchewan July 30-31; and the Clubroot Galla in Brooks, Alberta July 31-August 1.

    Follow @CanolaWatch on Twitter. Here’s the canola tweet of the week:

    Tweet of the week July 24

    READ MORE







    Canola Watch quiz

    Quiz July 24

    You find bertha armyworms at economic thresholds and you plan to spray. Before spraying, you need to estimate how many days it will be before you cut the crop. Why?

    READ MORE







    Top 10 things to consider when scouting for insects

    3. Record what you find. With detailed records, including insects found in each field, insect numbers, what they’re feeding on, time of day, temperature and weather conditions, you know which fields to scout more frequently, and you have comparison points for other fields and other years. 2. Follow thresholds. Every major insect of pest of canola has an economic control threshold. See the table below.
    1. Pre-harvest intervals. If spraying is necessary, choose a product with a pre-harvest interval that fits within the timeframe between spraying and cutting the crop.

    READ MORE







    Insect update — Bertha armyworm, thrips

    Thrips feeding can lead to curled pods.

    Thrips damage shows up in some fields. Bertha armyworms are the bigger issue, with adult counts continuing to build and many areas now at moderate risk, or higher. Read more to see links to latest maps and counts.

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    Scouting late July for disease

    Sclerotinia stem rot infection starts as leaf or stem infection around a rotting petal.

    The window to control disease in canola is closed, so why scout? Well, because the period from podding to harvest is the easiest time to see diseases. And if you can identify which diseases are present, you can adjust your variety choice, crop rotation and fungicide use for subsequent years.

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    July 17, 2013




    Issues of the week

    Diamondback moth larvae feeding on pods.

    The pod stage is the critical time to watch for insect feeding in canola. When flowering is done, the crop cannot produce more flowers to compensate for insect losses. Thresholds for insects such as bertha armyworm, diamondback moth larvae (shown in the photo above) and lygus bugs are based on losses at pod feeding.

    However, take care with timing. Jumping the gun with early insecticide applications on flowering canola can create a whole lot of trouble for beneficials, have limited benefit in terms of insect management, and be a step back in sustainability. With a healthy beneficial population, insect outbreaks are never as severe as they will be without the beneficials to keep populations in check. Adding insecticide to a fungicide mix may “only” cost $5 per acre, but the timing is not right for insect management — other than for cabbage seedpod weevil if at thresholds. There are likely many other better ways to spend that money — including waiting until early pod stages to spray. If finding time to scout is an issue, consider spending part of the $5 per acre to hire someone to scout for you.

    Tweet of the week, from the July 17 #ABbugchat on Twitter:

    Tweet of the week July 17

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    Canola Watch quiz

    Quiz July 17

    What is this worm?

    READ MORE







    Grasshopper thresholds

    grasshopper feeding small

    Grasshopper numbers are at or near thresholds in some regions of the Prairies. The nominal threshold for grasshoppers in canola is 8-12 per metre square. How you go about counting them is the challenge. As soon as you walk into an area, grasshoppers take off and do not cooperate with your attempts to count them. So entomologists have come up with a more practical scouting technique. It involves three steps…

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