Joseph Tomecek (Tomecek Agronomic Services/M.Sc. candidate, Dept. of Plant Agriculture, Univ. of Guelph); Elaine Roddy (OMAFRA), Amanda Tracey (OMAFRA), Dr. Cheryl Trueman (Ridgetown Campus, Univ. of Guelph)
We continue to monitor for the presence of Phytophthora infestans (late blight) and Pseudoperonospora cubensis (cucurbit downy mildew) in Kent and Norfolk counties using spore traps. Spore traps monitoring for causal agents of tomato late blight and cucurbit downy mildew in Kent, Elgin and Norfolk Counties – ONvegetables
Spore traps were installed the week of June 7, 2021. No DNA of P. infestans or P. cubensis was detected by Spornado traps or rotorod traps between June 7th and June 28.
Phytophthora infestans DNA (late blight)
| 2021 Testing Period | Kent County Spornado Positive Detections (/8 sites) | Kent County Rotorod Positive Detections (/8 sites) | Elgin/Norfolk Spornado Positive Detections (/7sites) |
| July 12-15 | 0 | 0 | 0 |
| July 15-19 | 0 | 0 | 0 |
| July 19-22 | 0 | 0 | 0 |
| July 22-26 | 0 | 1 | 0 |
| July 26-29 | 0 | 0 | 0 |
| July 29-Aug 2 | 0 | 0 | 0 |
A summary of fungicides for late blight management on tomatoes is available here. If you suspect late blight in your tomato crop, please reach out to Amanda Tracey (Amanda.tracey@ontario.ca, 519-350-7134) or Dr. Cheryl Trueman (ctrueman@uoguelph.ca, 519-674-1500 ext. 63646) to confirm the diagnosis.
Pseudoperonospora cubensis DNA (cucurbit downy mildew)
| 2021 Testing Period | Kent County Spornado Positive Detections (#/8 sites) | Elgin/Norfolk Spornado Positive Detections (#/8 sites) |
| July 12-15 | 1 | 1 |
| July 15-19 | 0 | 0 |
| July 19-22 | 0 | 0 |
| July 22-26 | 3 | 1 |
| July 26-29 | 0 | 0 |
| July 29-Aug 2 | 4 | 4 |
A summary of fungicides for downy mildew management on cucumbers is available here. If you suspect downy mildew in your cucumber crop, please reach out to Elaine Roddy (elaine.roddy@ontario.ca, 519-401-5890) or Dr. Cheryl Trueman (ctrueman@uoguelph.ca, 519-674-1500 ext. 63646) to confirm the diagnosis.
Project collaborators: Yaima Arocha Rosete (Sporometrics), Hervé van der Heyden (Phytodata), Rene van Acker & Rachel Riddle & John O’Sullivan (University of Guelph), and Genevieve Marchand (AAFC).
Funding acknowledgement: Ontario Tomato Research Institute, Fresh Vegetable Growers of Ontario, the Ontario Agri-Food Innovation Alliance, Canadian Agricultural Partnership, OMAFRA Plant Health Fund.
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