By: Dr. Cheryl Trueman, Ridgetown Campus – University of Guelph
About these tables:
- These tables were created using results from replicated processing tomato field trials at the Ridgetown Campus, University of Guelph. Please contact the author for more information on research methods and copies of full reports. The tables are for information only and do not guarantee successful results with the use of any product.
- Always check the most recent version of the product label before applying any product. Listed products are registered for field tomatoes in Canada but may not be registered for the specific crop-disease combination for which they are listed in the tables.
Late blight:
- An Ontario-specific version of fungicide ratings for late blight by Janice LeBoeuf (formerly OMAFRA) was updated in 2017 and is posted here.
Anthracnose (fruit rot):
- Fungicide trials for anthracnose management are completed on a regular basis at the Ridgetown Campus, University of Guelph. Only data from trials with high disease pressure were considered in developing these ratings. Fungicide applications were made using labelled rates on a 10-day interval.
| Trade Name* | Active Ingredient(s) | FRAC Group(s) | # of Trials | Rating** |
| Various | Mancozeb | M3 | 1 | +++ |
| Various | Chlorothalonil | M5 | 5 | +++ |
| Inspire | Difenoconazole | 3 | 3 | + |
| Bravo Top | Difenoconazole + chlorothalonil | 3 + M5 | 3 | +++ |
| Lance / Cantus WDG | Boscalid | 7 | 3 | 0 |
| Aprovia | Benzovindiflupyr | 7 | 2 | +++ |
| Sercadis | Fluxapyroxad | 7 | 2 | ++ |
| Fontelis | Penthiopyrad | 7 | 3 | +++ |
| Reason | Fenamidone | 11 | 1 | 0 |
| Cabrio | Pyraclostrobin | 11 | 3 | +++ |
| Quadris | Azoxystrobin | 11 | 4 | +++ |
| Quadris Top | Azoxystrobin + difenoconazole | 11 + 3 | 3 | +++ |
Early blight:
- Early blight ratings are from trials completed when disease pressure was high (ie. high level of defoliation in nontreated plots) and significant levels of late blight were absent. A mixed infection of Septoria leaf spot and early blight occurred in some years. Fungicide applications were made using labelled rates on a 10-day interval.
| Trade Name* | Active Ingredient(s) | FRAC Group(s) | # of Trials | Rating** |
| Cueva | Copper octonoate | M1 | 3 | 0 |
| Various | Mancozeb | M3 | 2 | + |
| Maestro | Captan | M4 | 1 | ++ |
| Various | Chlorothalonil (3.2 L/Ha) | M5 | 3 | ++ to +++ |
| Chlorothalonil (2.4 L/Ha) | M5 | 2 | +++ | |
| Inspire | Difenoconazole | 3 | 1 | ++ |
| Lance / Cantus WDG | Boscalid | 7 | 1 | +++ |
| Sercadis | Fluxapyroxad | 7 | 3 | + to +++ |
| Fontelis | Penthiopyrad | 7 | 3 | ++ to +++ |
| Luna Privilege | Fluopyram | 7 | 2 | ++ to +++ |
| Aprovia TOP | Benzovindiflupyr + difenoconazole | 7 + 3 | 3 | +++ |
| Miravis Duo | Pydiflumetofen (‘Adepidyn’) + difenoconazole | 7 + 3 | 2 | +++ |
| Scala SC | Pyrimethanil | 9 | 1 | ++ |
| Reason 500SC | Fenamidone | 11 | 1 | ++ |
| Cabrio EG | Pyraclostrobin | 11 | 1 | ++ |
| Quadris | Azoxystrobin | 11 | 4 | +++ |
| Quadris Top | Azoxystrobin + difenoconazole | 11 + 3 | 1 | +++ |
| Tanos 50 DF | Famoxadone + cymoxanil | 11 + 27 | 3 | + to +++ |
| Phostrol | Mono- and di-potassium salts of phosphorous acid | 33 | 3 | 0 |
| Phostrol + Cueva | Mono- and di-potassium salts of phosphorous acid + copper octonoate | 33 + M1 | 2 | 0 to + |
| Phostrol + Bravo ZN | Mono- and di-potassium salts of phosphorous acid + chlorothalonil (2.4 L/Ha) | 33 + M5 | 3 | +++ |
| Phostrol + Cueva + Diplomat | Mono- and di-potassium salts of phosphorous acid + copper octonoate + polyoxin D zinc salt | 33 + M1 + 19 | 1 | + |
Septoria leaf spot:
- Septoria leaf spot ratings represent results of three efficacy trials when disease pressure was high and significant levels of late blight were absent. A mixed infection of Septoria leaf spot and early blight occurred in some years. Fungicide applications were made using labelled rates on a 10-day interval.
| Trade Name* | Active Ingredient(s) | FRAC Group(s) | # of Trials | Rating** |
| Cueva | Copper octonoate | M1 | 3 | 0 |
| Various | Mancozeb | M3 | 2 | + |
| Maestro | Captan | M4 | 1 | ++ |
| Various | Chlorothalonil (3.2 L/Ha) | M5 | 4 | ++ to +++ |
| Chlorothalonil (2.4 L/Ha) | M5 | 2 | +++ | |
| Bravo Top | Chlorothalonil + difenoconazole | M5 + 3 | 1 | +++ |
| Aprovia | Benzovindiflupyr | 7 | 1 | +++ |
| Sercadis | Fluxapyroxad | 7 | 4 | ++ to +++ |
| Fontelis | Penthiopyrad | 7 | 3 | ++ to +++ |
| Luna Privilege | Fluopyram | 7 | 2 | ++ to +++ |
| Aprovia TOP | Benzovindiflupyr + difenoconazole | 7 + 3 | 3 | +++ |
| Miravis Duo | Pydiflumetofen (‘Adepidyn’) + difenoconazole | 7 + 3 | 2 | +++ |
| Quadris | Azoxystrobin | 11 | 4 | +++ |
| Quadris Top | Azoxystrobin + difenoconazole | 11 + 3 | 1 | +++ |
| Tanos | Famoxadone + cymoxanil | 11 + 27 | 2 | + to +++ |
| Phostrol | Mono- and di-potassium salts of phosphorous acid | 33 | 3 | 0 |
| Phostrol + Cueva | Mono- and di-potassium salts of phosphorous acid + copper octonoate | 33 + M1 | 2 | 0 to + |
| Phostrol + Bravo ZN | Mono- and di-potassium salts of phosphorous acid + chlorothalonil (2.4 L/Ha) | 33 + M5 | 3 | +++ |
| Phostrol + Cueva + Diplomat | Mono- and di-potassium salts of phosphorous acid + copper octonoate + polyoxin D zinc salt | 33 + M1 + 19 | 1 | + |
Interested in a product not on the list?
If you didn’t find the product information you were looking for, check out the fungicide efficacy ratings from other locations:, New York (late blight), New York (late blight, early blight).
Keep in mind that the efficacy ratings linked above are US sources and not all of the products are registered in Canada, or registered on late blight of field tomato. For information on registered tomato fungicides for Ontario, see the NEW Ontario Crop Protection Hub. Always read and understand the label before using any crop protection product.