All posts by Dennis Van Dyk

Re-cropping after Callisto or Command?

Kristen Obeid, OMAFRA Weed Specialist – Horticulture

Callisto and Command are relatively new herbicides to various horticulture crops in Ontario.  They both cause bleaching symptoms even though Callisto is a Group 27 herbicide and Command is a Group 13.  Group 27 and Group 13 herbicides are categorized as carotenoid biosynthesis inhibitors.  Group 27 herbicides are also frequently referred to as HPPD inhibitors.  This refers to the inhibition of p-hydroxyphenyl pyruvate dioxygenase (HPPD).  The  inhibition of HPPD gives rise to bleaching symptoms on new growth.

Command injury on tomato due to drift.

Continue reading Re-cropping after Callisto or Command?

AAFC Potato Variety Release Open House

Any potato grower interested in new potato varieties for fresh, specialty, french fry or chip are invited to the AAFC potato variety release open house:

Wednesday, February 14
95 Stone Road (Lab Services Building)
Guelph, ON
11:00 am – 2:00 pm

More information on how the process works can be found HERE

If you plan to attend, please RSVP to Vanessa Currie ( 519-824-4120 ext 56160

Variety viewing begins at 11:00 with a free lunch and a short session of informative presentations. The schedule for the speakers can be found below. schedule


New Vegetable and Fruit Washwater Treatment Manual – Publication 854


In a packing facility, water is used to move, cool and wash vegetables and fruits. This water must be managed in a way that promotes environmental stewardship and ensures compliance with food safety and environmental regulations.

The manual provides vegetable and fruit packers with a strategy to select and manage washwater treatment equipment based on a water management plan. It also shows why good washwater management on the farm or at the packing facility is important.

Click on the cover above or follow the link below to view the manual.

Minor Use Label Expansion – Prowl H2O for transplant tomatoes on mineral soil

Jim Chaput – OMAFRA, Minor Use Coordinator

The Pest Management Regulatory Agency (PMRA) recently announced the approval of minor use label expansion registration for Prowl® H2O Herbicide for control of labeled weeds on transplanted field tomatoes grown in mineral soil in Canada. Prowl® H2O Herbicide was already labeled for use on a number of crops in Canada for control of several weeds.

This minor use project was submitted by Ontario as a result of minor use priorities established by growers and extension personnel.

The following is provided as an abbreviated, general outline only. Users should be making weed management decisions within a robust integrated weed management program and should consult the complete label before using Prowl® H2O Herbicide.

Crop Target Rate (L/ha) Application Information PHI (days)
Transplanted field tomatoes Labeled weeds 2.2 Apply once as a broadcast surface application prior to transplanting tomatoes 21

Prowl® H2O Herbicide is toxic to aquatic organisms and non-target terrestrial plants.  Do not apply this product or allow drift to other crops or non-target areas. Do not contaminate off-target areas or aquatic habitats when spraying or when cleaning and rinsing spray equipment or containers. In field tomatoes, do not apply Prowl® H2O Herbicide more than once in two consecutive years.

Follow all other precautions, restrictions and directions for use on the Prowl® H2O Herbicide label carefully.

For a copy of the new minor use label contact your local crop specialist, regional supply outlet or visit the PMRA label site

Minor Use Label Expansion – Delegate for flea beetles on root vegetables

The Pest Management Regulatory Agency (PMRA) recently announced the approval of a Minor Use label expansion of Delegate Insecticide for suppression of flea beetles on several root vegetables. Crops added to the label:

  • Radish
  • Horseradish
  • Oriental Radish
  • Rutabaga
  • Turnip
  • Carrot

Delegate was already labeled for control of diamondback moth, cabbage looper and imported cabbageworm on these crops.

The following is provided as an abbreviated, general outline only. Users should consult the complete label before using Delegate Insecticide.

Crops Target Rate Max. # of Applications per year Pre-Harvest Interval (PHI)
  • Carrot
  • Radish
  • Horseradish
  • Oriental Radish
  • Rutabaga
  • Turnip
Flea Beetles (suppression) 200 g/ha

(81 g/acre)

3 3 days

Follow all other precautions and directions for use on the Delegate label carefully.


Vegetable Summer Student Positions for OMAFRA in Guelph

Job Posting: Field Research Assistant – Pest Management Scout in Vegetable Crops
Organization: Ontario Ministry of Agriculture, Food and Rural Affairs
Division/Branch: Economic Development Division / Agriculture Development Branch
Position Title: Student – Field Research Assistants in Vegetable Crops
Job Term: Temporary (3 positions) for up to 18 weeks
Location:  1 Stone Road W, Guelph, Ontario
Salary: $14.85 / hour, based on a 36.25 hour work week

Closing Date: January 12, 2018

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Spray Coverage in Carrot Potato and Onion

Jason Deveau, Application Technology Specialist – OMAFRA;
Dennis Van Dyk, Vegetable Crop Specialist – OMAFRA

In recent years, Syngenta has been promoting the Defy 3D nozzle in the UK, which is a 100° flat fan, designed to run alternating 38° forward or backward along the boom. They prescribe a boom height of 50 to 75 cm, 30-40 psi, and travel speeds of 10 to 14 km/h in cereals and vegetables. Compared to a conventional flat fan, they claim that the angle and medium-coarse droplets promise less drift and improved coverage.

In 2017, Hypro and John Deere began distributing the Defy 3D in North America. Our goal was to explore coverage from the 3D in vegetable crops. We compared the nozzle’s performance to common grower practices in onion, potato and carrot in the Holland Marsh area of Ontario.


Continue reading Spray Coverage in Carrot Potato and Onion