Temperature – Daytime temperatures are forecasted to stay around the low twenties over the next week. All regions remain above their GDD 10-year average.
Cabbage maggot is at its final threshold in the regions of Huron, Wellington, Simcoe, Peterborough, and Kemptville. In the overlap region of Wellington County European Corn Borer will be going through its third peak catch most likely within the next week. GDD data for each region is shown below.
Rainfall – Most regions are forecasted to have some rain over the weekend and continuing into the following week. So far Huron County is the only region that has experienced any rainfall in the month of September. Rainfall data for each region is shown below.
Brassica Crops – Alternaria is becoming more widespread across the province. Depending on the Brassica crop grown, not all fungicides are labelled for use; see Table 1 below for fungicides registered on different Brassica crop groups. The second generation of cabbage maggot is underway across many Brassica growing regions. Diamondback moths, imported cabbageworms, and tarnished plant bugs are active. Avoid scouting or working in the crop when the crop is wet and start from the cleanest plantings first and move to plantings with known pathogens later in the day.
Celery – Conditions continue to be favourable for bacterial blight. Continue to scout for Cercospora and Sclerotinia pink rot and celery leaf curl. Avoid scouting when leaves are wet as pathogens can spread easily on clothes/equipment throughout the field. Disc harvested blocks to reduce pest pressure and plant a cover crop to prevent soil erosion. Continue to scout for tarnished plant bugs, aster leafhoppers, leafminers and aphids.
Onions – Fields are continuing to lodge or have been windrowed and harvested already. Hopefully, conditions are favourable for harvest over the next couple of weeks. The 2021 Muck Crops Research Station Grower Field Day is September 9th from 8:30 AM– 4:00 PM. Check out cultivar evaluations and research trials at 1125 Woodchoppers Lane, King, ON. This year, Haggerty Creek will be showcasing the Naio Oz and Korechi RoamIO robotic weeders at 10 AM, 12 AM and 2 PM at the Grower Field Day.
Pest Degree Day Forecasting
*NOTE: Data as of September 1, 2021
|County||Carrot Rust Fly||Onion Maggot||Carrot Weevil||Aster Leafhopper||Tarnished Plant Bug||Cabbage Maggot||Seedcorn Maggot||European Corn Borer|
|THRESHOLD||329-395, 1399-1711||210-700, 1025-1515||138-156, 455+||128+||40+||314-398, 847-960, 1446-1604||200-350, 600-750, 1000-1150||See legend below|
*- Bivoltine region for ECB. First Peak Catch: 300-350 DD, Second Peak Catch 1050-1100 DD
**- Overlap region for ECB. First Peak Catch: 300-350 DD Second Peak Catch 650-700 DD, Third Peak Catch 1050-1100 DD
***-Univoltine region for ECB. Peak Catch 650-700 DD
Use these thresholds as a guide, always confirm insect activity with actual field scouting and trap counts.
Select a region below for the latest weather, crop and pest degree day information: