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VCR – Vegetable Crop Report – September 4

The VCR (vegetable crop report) is a weekly update which includes crop updates, weather and growing degree summaries for various vegetable growing regions across Ontario. Continue Reading VCR – Vegetable Crop Report – September 4

Ontario DD Map - September 4Temperature – Generally cooler weather combined with heavier morning dews and some precipitation has continued to be conducive to the development of plant pathogens in many of the vegetable growing regions in the past week. Continue being vigilant for symptoms of pathogen infection in fields which are not yet harvested, and incorporate remaining plant material into the ground once fields are harvested. Chatham, Essex, Kemptville, Norfolk and Wellington growing regions held steady with their average degree day accumulations, while remaining regions continue to be significantly to marginally behind their average degree day accumulations. 

Rainfall – August brought no clear trend in precipitation with Durham and Norfolk counties receiving above average rain for the month, and others ranging from just below average to significantly below. The Essex, Huron, and Sudbury growing regions are well on their way to their September precipitation averages, while the other regions range from no precipitation to about 5 mm in the first few days of the month. 

Crop Updates

Brassica Crops – Diamondback moths and flea beetles continue to be the most common insect challenge this year. Conditions have been favourable for Alternaria, black rot and fusarium wilt.

Carrot – Risk of disease is the main issue in carrots currently. Be on the lookout for Alternaria and Cercospora leaf blights developing on older leaves as the overnight temperatures cool. Also be sure to check between the rows under the canopy for signs of white mould starting to develop on old and dying leaves.

alternaria.jpg                              Picture 1: A patch of Alternaria leaf blight. 

white rotPicture 2: White Mould of Carrot growing on lower leaves.

Celery – Celery harvest is underway. For late plantings, continue to scout for bacterial blight, pink rot and celery leaf curl. Avoid scouting when leaves are wet as pathogens can spread easily on clothes and equipment throughout the field.

Garlic – Planting season is underway in some areas. Early plantings have an increased chance of bolting and winterkill. When purchasing planting stock this fall, send some cloves for bulb and stem nematode testing prior . Even cloves with an intact basal plate and no observable damage may have nematodes. There will be another full day workshop in Guelph on December 4th that will cover every part of garlic production including clean seed, cultivar selection, seeding density, nutrient testing, scape removal, weed control, crop insurance, harvesting, grading, storing as well as scouting/pest management. To register, call the Agriculture Information Contact Centre at 1 877-424-1300.

Onions – Harvest is underway in transplants and some early direct seeded onions. The level of thrips has reached the spray threshold in most areas. Downy mildew was been confirmed in Ontario transplant onions last week; but conditions have not been favourable for sporulation and infection in the major onion growing regions. The weather has been conducive for Stemphylium leaf blight development which has caused significant leaf tip dieback in some areas. Conditions have also been favourable for pink root and onion smut development this year and will impact the yield in many fields come harvest.

Potatoes – The threat of late blight remains front and center as some fields will need a few more weeks of green tops and good weather to fill out. Plants infected with late blight were confirmed in Norfolk county last week but there have been no new reports. The season also seems to bring a late flush of insects as black cutworms have popped up and a small amounts of aphids have been seen in some fields. Continue to scout you fields for signs of disease and insects as the finish line draws nearer.

 

Pest Degree Day Forecasting

PestCarrot Rust FlyOnion Maggot Carrot WeevilAster LeafhopperTarnished Plant Bug Cabbage Maggot Seedcorn MaggotEuropean Corn Borer 
THRESHOLD329-395, 1399-1711210-700, 1025-1515138-156, 455+128+40+314-398, 847-960, 1446-1604200-350, 600-750, 1000-1150See legend below
Essex*2288212416621380997181221241244
Chatham-Kent*2089192814781202792162319281073
Norfolk**2013185814191151745156118581025
Huron***17841635122196859413521635850
Wellington**17741628121696859813481628854
Simcoe County***17951647123598761913661647873
Durham***189117431330108470714621743968
Peterborough17141565114989553012831565781
Kemptville***193117821365110671115001782981
Sudbury***15881455108385851412001455753

*- 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:

Essex County

Chatham-Kent County

Norfolk County

Huron County

Wellington County

Simcoe County

Durham County

Peterborough

Kemptville

Sudbury

 

Essex County

EssexDDSeptember4

EssexTPSeptember4

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Chatham-Kent County

ChathamDDSeptember4ChathamTPSeptember4

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Norfolk County

NorfolkDDSeptember4NorfolkTPSeptember4

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Huron County

HuronDDSeptember4HuronTPSeptember4

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Wellington County

WellingtonDDSeptember4WellingtonTPSeptember4

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Simcoe County

SimcoeDDSeptember4SimcoeTPSeptember4

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Durham County

DurhamDDSeptember4DurhamTPSeptember4

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Peterborough

PeterboroughDDSeptember4PeterboroughTPSeptember4

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Kemptville

KemptvilleDDSeptember4

KemptvilleTPSeptember4

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Sudbury

SudburyDDSeptember4SudburyTPSeptember4

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