Fungicide efficacy summary tables for management of diseases in field tomatoes

By 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.
• Only products labelled for ‘control’ of the specific disease are included in each table except where noted.
• Click on each table to see larger versions.

Late blight:

• An Ontario-specific version of fungicide ratings by Dr. Tom Zitter (Cornell University) for late blight was updated by Janice LeBoeuf (OMAFRA) in 2016 and is posted here.
• Some fungicides are not included in the summary. Efficacy trials completed in the Great Lakes Region suggest:
  • Zampro (Group 40 + 45, ametoctradin + dimethomorph): dimethomorph is rated ++ by Dr. Tom Zitter; Zampro was equivalent to programs using ++ and +++ rated fungicides in a trial in Pennsylvania.
  • Orondis Ultra (Group U15 + 40, oxathiapiprolin + mandipropamid): mandipropamid is rated ++ by Dr. Tom Zitter; oxathiapiprolin provided very good (+++) control when applied in rotation with ++ rated fungicides in a trial in Pennsylvania.

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.

Early blight:

• Early blight disease pressure is inconsistent at the Ridgetown Campus, University of Guelph. Ratings represent results of only one efficacy trial when disease pressure was high. Therefore, it is not possible to include observations on product consistency in ratings.

Septoria leaf spot:

Septoria leaf spot pressure is inconsistent at the Ridgetown Campus, University of Guelph. Ratings represent results of only one efficacy trial when disease pressure was high. Therefore, it is not possible to include observations on product consistency in ratings.

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: Wisconsin (late blight), New York (late blight), New York (late blight, early blight), Georgia (various tomato diseases).

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 OMAFRA’s Vegetable Crop Protection Guide and 2016 supplement.  Always read and understand the label before using any crop protection product.