The Grower March 2020

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MARCH 2020

CELEBRATING 141 YEARS AS CANADA’S PREMIER HORTICULTURAL PUBLICATION

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INTEGRATED PEST MANAGEMENT

The future: something old, something new

For the last two decades, Dr. Mary Ruth McDonald (right) has mentored dozens of students in her role as professor of plant agriculture, University of Guelph. Equally at home in the field, she’s pictured with Master’s student Alexandra Dacey. Together, they are documenting carrot weevil found in carrot trials at the Muck Crops Research Station in Bradford, Ontario. Photos by Glenn Lowson.

KAREN DAVIDSON Get set to count bodies on sticky traps. It’s not everybody’s idea of a summer job, yet dozens apply for the painstaking work of identifying insect pests at the Muck Crops Research Station, Bradford, Ontario. Know the difference between a carrot rust fly and a carrot weevil? Better yet, can you differentiate between the damage of the larvae? You’re hired.

“Not much has changed,” says Dr. Mary Ruth McDonald, professor of plant agriculture at the University of Guelph since 1997. “We’re still training summer students to identify insects and diseases. We thought drones with their aerial imagery would have a promising future, but there are still wrinkles to be sorted out.” These rituals are the basis of Integrated Pest Management (IPM) for onion and carrot growers, mostly resident in Ontario and Quebec. Together, they

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steward 20,000 acres of carrots and 13,400 acres of onions using IPM strategies: genetic, cultural, physical, biological and if necessary, chemical. Pesticides are a last resort. Growers rely on the crop scouts to say when an economic threshold has been exceeded and when it’s time to spray with reduced-risk insecticides. Onion and carrot grower Kyle Horlings is a neighbour to the Muck Crops Research Station. He knows firsthand how valuable the weekly crop

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scouting is, in addition to replicated, annual research trials. He cites the example of several years of fumigant testing with chloropicrin (Pic-Plus). “Instead of using a broadcast fumigant, we now use a site-specific fumigant in the hill of the carrot to kill nematodes and Pythium,” he says. “We’ve seen better crop yields in the Marsh.”

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Crop protection/spraying

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