Greenhouse Canada

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From the Editor: Aug 2009


September 15, 2009
By Dave Harrison


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This is an innovation-driven industry, stoked by the dedication of
suppliers and the research/extension community. Their work is then
often enhanced and tweaked by ingenious growers for even greater gains
and efficiencies.

This is an innovation-driven industry, stoked by the dedication of suppliers and the research/extension community. Their work is then often enhanced and tweaked by ingenious growers for even greater gains and efficiencies.

It’s a remarkable partnership. The scientific branch, allied trades and suppliers, and growers have worked especially close in growing one of Canada’s most vibrant horticultural sectors.

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A special milestone will be marked next month as the Greenhouse and Processing Crops Research Centre in Harrow, Ont., celebrates its centennial. An open house will be held on Saturday, Sept. 12, from 10 a.m. to 3 p.m. Featured will be tours, equipment displays and demonstrations, in addition to a barbecue lunch prepared by local 4H members.

Greenhouse crops have been a focus at the Centre since the 1940s, with the first research greenhouses constructed in 1948, according to retired researcher Dr. Gordon Ward. He wrote the Greenhouse Vegetables report published during the Centre’s 75th anniversary. Prior to 1947, the Centre – then called the Dominion Experimental Station – had several greenhouses, but they were used to grow tobacco transplants. “The greenhouse vegetable industry has changed a lot over the past 20 years, much higher yields are realized, production is on a more scientific basis, and many major problems have been faced and resolved,” said Dr. Ward. “Greenhouse vegetable research at the Harrow Research Centre has played a major role in this change.”

This edition takes a closer look at the history of research at Harrow. It’s a fascinating recap, offering a brief sampling of some of the work.

Mass production of Encarsia formosa was started by Dr. Bob McClanahan at the Centre in 1970-72, with considerable support and encouragement by local growers. “In 1974, Better Yield Insects Co. was formed in Ontario and started the first commercial production of E. formosa and Phytoseiulus persimilis, a predatory mite for two-spotted spider mite,” note Dr. Les Shipp (AAFC) and Gillian Ferguson (OMAFRA) in this issue. “These major accomplishments were the start of the commercial greenhouse biological control industry in Canada.”
The Centre has had decades of experience in assisting with powdery mildew controls, most recently focusing on new reduced-risk materials.

In 1987, Centre researchers began studying cover materials and demonstrated that tomato and cucumber yields are about the same under double poly as under glass, with the added benefit of a 30 per cent energy savings with the former. As a result of these findings, many of the greenhouses constructed in Leamington are double poly. It’s estimated the move has meant construction savings of close to a billion dollars and energy savings of 30 per cent, as compared to glass.

Grow-pipe research at Harrow, among other projects, has significantly improved microclimate management, leading to improved fruit quality and less disease.

Harrow has long been a major contributor to the success of the Canadian greenhouse vegetable sector. And it’s had great partners, with companies and growers helping sponsor research and supply project ideas. Growers in every region of Canada have benefited from work done there.

Next month’s open house is a well-warranted celebration.


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