Temperature – Almost all regions continue to match or surpass their 10 year average GDD except for Peterborough which has fallen fairly below it’s average. Huron county and Sudbury are also marginally below. High daytime temperatures are forecasted throughout the week ranging in the mid-twenties to thirties. Nighttime temperatures are expected to range in the high-teens to low twenties for much of the province.
Precipitation – All regions saw at least a small amount rain over the last week but Kemptville received a substantial amount and is now at over half of it’s 10 year precipitation average. Rain showers and a risk of thunderstorms are forecasted over the weekend. Regions other than those in southwestern Ontario may also see showers and thunderstorms towards the middle of the week.
Cucumbers – Cucurbit downy mildew was identified in East Elgin on July 14, 2022. This is the first confirmed case of downy mildew in cucumbers this year. The risk of further infections is now high. All growers should begin using downy mildew targeted fungicides.
Garlic – As harvest approaches, monitor the number of leaves that senesce. The ideal time to harvest porcelain cultivars (such as the cv ‘Music’) is when 50% of the leaves have senesced / turned yellow. Since it takes several days to harvest, many start harvesting at 40% and by the time the crop is fully harvested it may have reached 70%.
There are still a few spots remaining for the next Garlic Production and Pest Management workshop near Janetville, ON, that takes place Friday, August 19th from 9:30-4:30. Register by calling 1-877-424-1300 or by filling out this online form: https://survey.clicktools.com/app/survey/go.jsp?iv=1y59n0qcz8rld.
Pest Degree Day Forecasting
*NOTE: Data as of July 13, 2022
|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: