Disease Insects Pest Management Vegetables Weather

VCR: Vegetable Crop Report – June 18, 2018

Ontario DD Map June 14

Temperature – After a cool April, growing degree days have caught up to the 10-year average and surpassed the average in most areas towards the latter part of May. That trend has continued with this recent hot weather in many areas.

Rainfall –  After a wet April and a variable May, June has been dry. At just over halfway through the month of June, all regions across the province have accumulated below the average for this time. Many regions have accumulated less than 10mm of rain so far in June.

 

Crop Updates

Brassica Crops – Tarnished plant bugs are active. Flea beetles are in high numbers in some areas and will be more active at higher temperatures. Continue to scout for diamondback moth, cabbageworm, aphids and thrips. The first generation of cabbage maggot has emerged in most areas of Southwestern Ontario.

Carrots – Carrot weevil activity is winding down but the risk is still high in some fields. Carrot rust fly has reached the degree day threshold for emergence in the SW part of the province. Aster leafhoppers have been observed on sticky traps but numbers are low in most fields.

Celery – Scout for tarnished plant bugs as they are emerging and are typical found first around field borders.

Garlic – Many areas have seen scape emergence in the last week. Scout for slim, light-green 6-14mm leek moth larvae and look for damage on the newest leaves. Yellowing of foliage and tip dieback of older leaves is likely due to stress from herbicide damage, nutrient deficiency or dry conditions. Use a shovel to dig wilted plants and look for seedcorn maggot larvae, wireworms or rot in the basal plate. Rot in the basal plate may be due to bulb and stem nematode, white rot or Fusarium coming in as a secondary pathogen. Healthy roots should be white with very little brown to dark brown.

Onion – Earliest direct seeded onions are at the forth leaf stage while the majority of fields are in the 2nd leaf stage. Onion maggot flies are present and low levels of thrips are being seen in transplant fields where there are 5-6 true leaves. Thrips are usually first detected along field borders. Pull the leaves apart and look down into the leaf base for 2mm-long grey adults or very small yellow nymphs ~1mm in length. Onion fields next to hay or overwintering rye are at a greater risk as thrips move once the hay or rye is cut. The spray threshold for onion thrips is one thrips per leaf of plant from an average of 50 plants.

Potatoes – Late blight has been confirmed on tomatoes in New York State this past week. Even with this stretch of hot and dry weather, growers should be diligent in scouting for any signs of the disease. Remove any cull piles or volunteers on your farm. Many growers have been busy irrigating during this stretch of warm weather and lack of rainfall. Fields are flowering in the South Western regions of the Province and the crop is starting to size up nicely.

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

EssexDD June18EssexTP June18

LocationOnion MaggotSeedcorn MaggotCabbage MaggotLeek MothCarrot WeevilCarrot Rust FlyAster LeafhopperEuropean Corn Borer
For reference on the various thresholds, see table at the very bottom of this post.
Essex676676557504503742402355

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Chatham-Kent County

Chatham-KentDD June18Chatham-KentTP June18

LocationOnion MaggotSeedcorn MaggotCabbage MaggotLeek MothCarrot WeevilCarrot Rust FlyAster LeafhopperEuropean Corn Borer
For reference on the various thresholds, see table at the very bottom of this post.
Chatham-Kent642642529459479706381334

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Norfolk County

NorfolkDD June18NorfolkTP June18

LocationOnion MaggotSeedcorn MaggotCabbage MaggotLeek MothCarrot WeevilCarrot Rust FlyAster LeafhopperEuropean Corn Borer
For reference on the various thresholds, see table at the very bottom of this post.
Norfolk593593488415438650345302

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Wellington County

WellingtonDD June18WellingtonTP June18

LocationOnion MaggotSeedcorn MaggotCabbage MaggotLeek MothCarrot WeevilCarrot Rust FlyAster LeafhopperEuropean Corn Borer
For reference on the various thresholds, see table at the very bottom of this post.
Wellington548548442377392604299254

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Huron County

HuronDD June18HuronTP June18

LocationOnion MaggotSeedcorn MaggotCabbage MaggotLeek MothCarrot WeevilCarrot Rust FlyAster LeafhopperEuropean Corn Borer
For reference on the various thresholds, see table at the very bottom of this post.
Huron541541436374388597294252

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Simcoe County

SimcoeDD June18SimcoeTP June18

LocationOnion MaggotSeedcorn MaggotCabbage MaggotLeek MothCarrot WeevilCarrot Rust FlyAster LeafhopperEuropean Corn Borer
For reference on the various thresholds, see table at the very bottom of this post.
Simcoe533533429112380586289246

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Durham County

DurhamDD June18DurhamTP June18

LocationOnion MaggotSeedcorn MaggotCabbage MaggotLeek MothCarrot WeevilCarrot Rust FlyAster LeafhopperEuropean Corn Borer
For reference on the various thresholds, see table at the very bottom of this post.
Durham527527424120375583285244

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Peterborough

PeterboroughDD June18PeterboroughTP June18

LocationOnion MaggotSeedcorn MaggotCabbage MaggotLeek MothCarrot WeevilCarrot Rust FlyAster LeafhopperEuropean Corn Borer
For reference on the various thresholds, see table at the very bottom of this post.
Peterborough537537429107379592286243

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Kemptville

KemptvilleDD June18KemptvilleTP June18

LocationOnion MaggotSeedcorn MaggotCabbage MaggotLeek MothCarrot WeevilCarrot Rust FlyAster LeafhopperEuropean Corn Borer
For reference on the various thresholds, see table at the very bottom of this post.
Kemptville531531423115372589274230

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Sudbury

SudburyDD June18SudburyTP June18

LocationOnion MaggotSeedcorn MaggotCabbage MaggotLeek MothCarrot WeevilCarrot Rust FlyAster LeafhopperEuropean Corn Borer
For reference on the various thresholds, see table at the very bottom of this post.
Sudbury44144134691301492221186

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Thresholds

Use these thresholds as a guide, always confirm insect activity with actual field scouting and trap counts.

Degree Days
1st generation 2nd generation 3rd generation
Onion Maggot 210 1025 1772
Seedcorn Maggot 200 600 1000
Cabbage Maggot 314-398 847-960 1446-1604
Carrot Rust Fly 329 – 395 1399-1711 n/a
Leak Moth 445 Egg to adult development after two nights of >9°C
Carrot Weevil 138 – 156 Egg laying (oviposition) begins
455 90% of the egg-laying (oviposition) is complete
Aster Leafhopper 128 Overwintering eggs hatch
390 Local adult emergence

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