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Fungicide Efficacy Testing Results – Chickpeas

Fungicide efficacy testing results for Ascochyta blight of chickpeas from research trials conducted at NDSU research extension centers in Carrington, Minot, and Williston are presented.

 

FUNGICIDES REGISTERED FOR USE ON CHICKPEAS IN NORTH DAKOTA:

Boscalid (FRAC 7)   -   Endura 70WG (6 oz/ac)    Each kilogram of Endura contains 700 grams of boscalid.

  • EFFICACY DATA - Ascochyta blight, Endura applied sequentially:  2009 Carrington [ illustrated |  full ],  2010 Carrington [ illustrated  |  full ], 2011b Carrington/Minot [ illustrated  | full ], 2013 Williston [ illustrated  |  full ]   
  • EFFICACY DATA - Ascochyta blight, Endura applied in rotation with other fungicides:  2008 Carrington [ illustrated  |  full ], 2009 Carrington [ illustrated |  full ], 2010 Carrington [ illustrated  |  full ], 2011a Carrington [illustrated  |  full ], 2011c Carrington/Williston [ illustrated  |  full ], 2013 Williston [ illustrated  |  full ]  
  • EFFICACY COMMENTARY:  Endura (6 oz/ac) has showed equivalent efficacy as Proline (5 or 5.7 fl oz/ac) except when Ascochyta disease pressure is very high.  Under high disease pressure, Endura has sometimes been overwhelmed by the disease and provided poor disease control.  Endura can be an excellent partner with Proline in a rotational program, but it is best applied when disease pressure is low to moderate.  

Chlorothalonil (FRAC M5)   -   Bravo Weather Stik, Echo 720, Chlorothalonil 720, others (generally 1.38 to 2 pt/ac, but check label)    In most formulations, each liter of product contains 720 grams of chlorothalonil; as always, check the label.

  • EFFICACY DATA - Ascochyta blight, chlorothalonil applied in rotation with other fungicides:  2008 Carrington [ illustrated  |  full ], 2009 Carrington [ illustrated |  full ], 2010 Carrington [ illustrated  |  full ], 2011a Carrington [illustrated  |  full ], 2012 Williston [ illustrated  |  full ], 2013 Williston [ illustrated  |  full ]  
  • EFFICACY DATA - Ascochyta blight, chlorothalonil applied in a tank-mix with other fungicides:  2008 Carrington [ illustrated  |  full ], 2009 Carrington [ illustrated |  full ], 2010 Carrington [ illustrated  |  full ], 2012 Williston [ illustrated  |  full ]
  • EFFICACY COMMENTARY:  Chlorothalonil, applied as Echo 720 or Bravo Weather Stik at 1.4 or 1.5 pt/ac,  has shown satisfactory efficacy against Ascochyta blight when applied as the first application in a fungicide program if (1) Ascochyta blight is at zero or trace levels and (2) good coverage is achieved.  Chlorothalonil is a contact fungicide with no systemic activity, and it is not the most effective product when Ascochyta blight is already established or the canopy is closed and dense.

Fluopyram (FRAC 7) + prothioconazole (FRAC 3)   -   ProPulse 400SC (8.0 to 10.3 fl oz/ac)    Each liter of ProPulse contains 200 grams of fluopyram and 200 grams of prothioconazole.

  • EFFICACY DATA - Ascochyta blight, ProPulse applied sequentially:  2009 Carrington [ illustrated |  full ], 2010 Carrington [ illustrated  |  full ], 2011a Carrington [illustrated  |  full ]  
  • EFFICACY DATA - Ascochyta blight, ProPulse applied in rotation with other fungicides:  2008 Carrington [ illustrated  |  full ], 2010 Carrington [ illustrated  |  full ], 2011a Carrington [illustrated  |  full ]
  • EFFICACY COMMENTARY:  ProPulse has generally performed equally or slightly better than Proline.  However, when applied under conditions where the SDHI fungicide Endura (boscalid) was overwhelmed by Ascochyta disease pressure (see results from Carrington, 2009), ProPulse was less effective than Proline.  Results suggest that ProPulse will produce excellent results when disease pressure is modest, but that Proline might be a better choice when disease pressure is particularly high.

Fluxapyroxad (FRAC 7) + pyraclostrobin (FRAC 11)   -   Priaxor 500SC (4 to 8 fl oz/ac)    Each liter of Priaxor contains 333 grams pyraclostrobin + 167 grams fluxapyroxad.

  • EFFICACY DATA - Ascochyta blight, Priaxor applied sequentially:  2011a Carrington [illustrated  |  full ], 2012 Williston [ illustrated  |  full ], 2013 Williston [ illustrated  |  full ]  
  • EFFICACY DATA - Ascochyta blight, Priaxor applied in rotation with other fungicides:  2012 Williston [ illustrated  |  full ], 2013 Williston [ illustrated  |  full ]  
  • EFFICACY COMMENTARY:  Priaxor has not been tested extensively in our trials.  It has performed well, but it may exhibit the same weakness as Endura (boscalid) under high disease pressure.  Priaxor is a premix of fluxapyroxad (FRAC 7, the same mode of action as Endura) and pyraclostrobin (FRAC 11), and Ascochyta rabiei, the causal pathogen of Ascochyta blight on chickpeas, has developed resistance to FRAC 11 fungicides, which means that the efficacy of Priaxor is conferred primarily or exclusively by fluxapyroxad.  Until additional testing is conducted, it may be advisable utilize Priaxor similarly to Endura, targeting its use when Ascochyta disease pressure is low to moderate.

Prothioconazole (FRAC 3) - Proline 480SC (5.0 to 5.7 fl oz/ac)   Each liter of Proline contains 480 grams prothioconazole.

Penthiopyrad (FRAC 7) - Vertisan 200EC (14 to 20 fl oz/ac)   Each liter of Vertisan contains 200 grams penthiopyrad.

  • EFFICACY DATA - Ascochyta blight, Vertisan applied sequentially:  2011c Carrington/Williston [ illustrated  |  full ]
  • EFFICACY DATA - Ascochyta blight, Vertisan applied in rotation with other fungicides: 2012 Williston [ illustrated  |  full ]
  • EFFICACY COMMENTARY:  Vertisan has not been tested sufficiently to provide commentary on its efficacy.

Azoxystrobin (FRAC 11) - Quadris 250SC (6.2 to 15.4 fl oz/ac)   Each liter of Quadris contains 250 grams azoxystrobin.

  • EFFICACY DATA - Ascochyta blight, Quadris applied sequentially:  2011a Carrington [illustrated  |  full ]
  • EFFICACY COMMENTARY:  Quadris has no efficacy against Ascochyta blight of chickpeas in North Dakota.  Ascochyta rabiei, causal agent of Ascochyta blight on chickpeas, has developed resistance to FRAC 11 fungicides.  

Pyraclostrobin (FRAC 11)  - Headline (6 fl oz/ac)   Each liter of Headline contains 250 grams pyraclostrobin.

  • EFFICACY DATA - Ascochyta blight, Headline applied sequentially: 2011a Carrington [illustrated  |  full ], 2013 Williston [ illustrated  |  full ]  
  • EFFICACY DATA - Ascochyta blight, Headline applied in rotation:  2008 Carrington [ illustrated  |  full ], 2009 Carrington [ illustrated |  full ] 
  • EFFICACY COMMENTARY:  Headline does not have efficacy against Ascochyta blight of chickpeas in North Dakota.  Ascochyta rabiei, causal agent of Ascochyta blight on chickpeas, has developed resistance to FRAC 11 fungicides.  

Picoxystrobin (FRAC 11) - Aproach 250SC (6 to 12 fl oz/ac)   Each liter of Aproach contains 250 grams picoxystrobin.

  • EFFICACY DATA2011c Carrington/Williston [ illustrated  |  full ] 
  • EFFICACY COMMENTARY:  Aproach does not have efficacy against Ascochyta blight of chickpeas in North Dakota.  Ascochyta rabiei, causal agent of Ascochyta blight on chickpeas, has developed resistance to FRAC 11 fungicides.  

Azoxystrobin (FRAC 11) + difenoconazole (FRAC 3) - Quadris Top (8 to 14 fl oz/ac)   Each liter of Quadris Top contains 125 grams difenoconazole + 200 grams azoxystrobin.  No efficacy data are available for this product.

Azoxystrobin (FRAC 11) + propiconazole (FRAC 3) - Quilt (14 fl oz/ac)   Each liter of Quilt contains 75 grams propiconazole + 125 grams azoxystrobin.  No efficacy data are available for this product.

Bacillus subtilis strain QST 713(44)  - Serenade ASO (2 to 6 qt/ac) - No efficacy data are available for this product.

Azoxystrobin (FRAC 11) + chlorothalonil (FRAC M5) - Quadris Opti  Each liter of Quadris Opti contains 600 grams chlorothalonil + 60 grams azoxystrobin.    No efficacy data are available for this product, but Quadris Opti is expected to perform equivalently to chlorothalonil when applied for control of Ascochyta blight of chickpeas in North Dakota.  Ascochyta rabiei, causal agent of Ascochyta blight on chickpeas, has developed resistance to FRAC 11 fungicides.


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