Insensitivity of Ascochyta rabiei to Group 11 (strobilurin) fungicides has been documented by Dr. Michelle Hubbard with Agriculture and Agri-Food Canada in Swift Current. In 2019, 48 fields were surveyed for Ascochyta and every field that was confirmed with the disease had insensitivity to Group 11 fungicides. Ascochyta is the most damaging disease in chickpeas and managing the disease starts with scouting and preventative action using good agronomics, combined with effective fungicide applications.
To reduce the development of insensitivity in the pathogen it is important to use fungicides that have multiple modes of action that are effective on Ascochyta and avoid solo applications of Group 11 fungicides. It is also important to rotate groups of fungicides to prevent development of multiple insensitivity. Table 1 below outlines the current fungicide products registered for Ascochyta control and identifies the options available to help reduce the development of insensitivity or to manage those Group 11 insensitive populations.
Table 1. Fungicides registered for control of Ascochyta rabiei in chickpea. Activity on Group 11 insensitive Ascochyta indicated (Red = no activity; Green = activity)
| Fungicide | Company | Non Group 11 Component Registered for Control of Ascochyta rabiei* | Active Ingredients | Groups | Group 3 | Group 7 | Group 11 | Group M3 | Group M5 | Pre-Harvest Interval |
|---|---|---|---|---|---|---|---|---|---|---|
| A. GROUP 11 ONLY FUNGICIDES REGISTERED IN CHICKPEAS FOR ASCOCHYTA CONTROL | ||||||||||
| Azoshy 250 SC | Sharda Crop Chem | NA | Azoxystrobin | 11 | x | 15 days | ||||
| Headline® EC | BASF | NA | Pyraclostrobin | 11 | x | 30 days | ||||
| MPower Spade® | New Agco Inc | NA | Pyraclostrobin | 11 | x | 30 days | ||||
| Quadris® | Syngenta | NA | Azoxystrobin | 11 | x | 15 days | ||||
| B. NON GROUP 11 FUNGICIDES REGISTERED IN CHICKPEAS FOR ASCOCHYTA CONTROL | ||||||||||
| Bravo® 500 ZN | Syngenta | YES | Chlorothalonil | M5 | x | 14 days | ||||
| Echo® 720 | UAP | YES | Chlorothalonil | M5 | x | 48 days | ||||
| Lance® WDG | BASF | YES | Boscalid | 7 | x | 21 days | ||||
| CotegraTM | BASF | YES | Prothioconazole + Boscalid | 3 + 7 | x | x | 21 days | |||
| Proline® 480 SC | Bayer | YES | Prothioconazole | 3 | x | 7 days | ||||
| Quash® | Nufarm | Suppression | Metconazole | 3 | x | 21 days | ||||
| Proline® GOLD | Bayer | YES | Prothioconazole + Fluopyram | 3 + 7 | x | x | x | 14 days | ||
| C. FUNGICIDES WITH GROUP 11 + OTHER ACTIVES THAT ARE REGISTERED IN CHICKPEAS FOR ASCOCHYTA | ||||||||||
| Delaro® 325 SC | Bayer | YES | Prothioconazole + Trifloxystrobin | 3 + 11 | x | x | 30 days | |||
| Dyax™ | BASF | YES | Fluxapyroxad + Pyraclostrobin | 7 + 11 | x | x | 30 days | |||
| Elatus® | Syngenta | YES | Benzovindiflupyr + Azoxystrobin | 7 + 11 | x | x | 15 days | |||
| Lance® AG | BASF | YES | Boscalid + Pyraclostrobin | 7 + 11 | x | x | 30 days | |||
| Miravis® Neo 300SE | Syngenta | YES | Propiconazole + Pydiflumetofen + Azoxystrobin | 3 + 7 + 11 | x | x | x | 30 days | ||
| Priaxor® | BASF | YES | Fluxapyroxad + Pyraclostrobin | 7 + 11 | x | x | 30 days | |||
* Column indicates whether Ascochyta is on the label of individual active ingredients (other than Group 11).
