Snow mould, spray reports and water limits: how Canadian courses are really managed

In Canada, the environmental argument about golf courses is not really an argument about summer. It is about the week in late October when the crew sprays the greens before the snow arrives, about the provincial rules that decide what can go in the tank, and about how much water a course in Alberta or the Okanagan is allowed to draw in a dry August. Those rules are stricter here than most golfers realize, and they vary more from one province to the next than almost anything else in the game.

Here is what is going on behind the maintenance shed, province by province, and what it means for the course you play.

The Canadian problem: snow mould

Ask a superintendent in Quebec or Ontario what keeps them up at night and the answer is often not drought but winter. Snow mould diseases develop under snow cover and can kill large patches of putting surface by the time the snow melts in April. A green lost to winter damage means temporary greens for weeks, and sometimes a hole closed well into the season.

That is why the biggest single chemical use on Canadian courses tends to happen when nobody is playing. The Ordre des agronomes du Québec published a summary in March 2021 of the pesticide reduction plans filed by Quebec golf courses for 2015 to 2017. Fungicides made up 87.8% of use. Chlorothalonil, mineral oil and iprodione together accounted for more than three quarters of the active ingredients, applied largely as late-season preventive treatments against snow mould. The same summary put total golf course use at under 1% of all pesticide use in the province, and recorded a 5.3% drop in quantity per hectare between 2003 to 2005 and 2015 to 2017.

Two things follow for a player. The late-autumn sprays are not a sign of a careless course; they are insurance for the greens you will putt on next May. And the realistic path to less chemistry runs through the greens in October, not the rough in July.

Ontario: a ban with a golf course exception, and conditions attached

Ontario’s cosmetic pesticides ban took effect on April 22, 2009, under Ontario Regulation 63/09. Lawns, gardens and parks lost access to a long list of products. Golf courses kept access, on conditions that are worth knowing if you are a member.

According to the province’s guidance on pesticides and golf courses, a course using these restricted products must be registered with an approved integrated pest management body from the first day it uses them, and fully accredited by the second anniversary. Every year, before January 31, it must prepare an annual report summarizing that use, signed by its IPM agent. The most recent report must be publicly available and provided free on request. The IPM accreditation program run from the University of Guelph’s Ridgetown Campus notes that golf course reports are made available on the IPM Council of Canada website.

In plain terms: if you golf in Ontario and want to know what your club sprayed last year, the report exists and you are entitled to see it.

Quebec and Montreal: plans, signs and a municipal first

Quebec took a different route. Since 2006, Article 73 of the provincial Pesticides Management Code has required every golf course owner or operator to file a pesticide reduction plan with the environment ministry every three years. The Quebec government’s guidance says the plan must be signed by an agronomist and sent before April 3 following the last season of the three-year period.

The code also explains a sign you have probably walked past. Treated courses must post notices at the registration desk and at the tee of the treated holes, and keep a minimum distance of 3 metres from the course boundary and from any dwelling on the property.

Montreal then went further. Radio-Canada reported in June 2024 that the eight golf courses on the city’s territory would be brought under its municipal pesticide by-law from the 2025 season, banning 36 products including glyphosate. The exceptions are narrow: mecoprop and 2,4-D in spring against plantain, and chlorothalonil in autumn against snow mould. The city’s own trials on its municipal course, the report said, had produced comparable results with low-impact products.

For golfers in the rest of the country, Montreal is worth watching. It shows what golf maintenance looks like when a city removes most of the toolbox and leaves one exception for the disease that matters most in a Canadian winter.

Water: the West is where it bites

East of the Great Lakes, too much water is often the maintenance headache. On the Prairies and in the southern Interior of British Columbia, the opposite is true, and water supply shapes how a course looks in August.

Calgary gave the whole province a lesson in 2024. The City reports that the Bearspaw South Feeder Main, the largest in its network, suffered a catastrophic break on June 5, 2024. Emergency repairs ran through June, and a further 21 urgent repairs followed from August 26 to September 22, with more work in the autumn. The City put outdoor water restrictions back in place for the late-summer repair window, and every irrigated property in the city, golf courses included, had to plan its watering around a pipe.

In the Okanagan, regional districts publish drought-related water restrictions, and B.C.’s Water Sustainability Act allows the province to issue temporary protection orders to licensees when drought threatens fish and streams. A course holding a water licence in a dry valley is not in the same position as one irrigating from its own storage pond or from treated effluent.

Which is why the question worth asking at any Western club is not only how much water the course uses, but where it comes from, and what happens under the next restriction.

A tan fairway in August is a choice

When water is scarce or restricted, superintendents typically cut back on the areas that matter least to play first. Rough usually goes off before fairways, fairways before tees, and greens are protected to the end. A course that fades to straw colour at the edges in late summer is usually a course following that order, not one being neglected.

Firm, dry turf also has golf in its favour. The ball releases, the ground becomes part of the shot, and drier turf tends to carry less disease pressure. The comparison that causes trouble is with televised tournament conditioning, which reflects a short, expensive peak that no member club can hold for a whole season.

The acres nobody plays

A good share of any eighteen-hole property is out of play: woodlots, wetland edges, ponds, long grass between holes. That is where wildlife lives and where maintenance can be cut back most easily. Turning mown rough into naturalized areas saves mowing hours, fuel and water at once.

Clubs that want an outside check on that work can enrol in Audubon International’s Cooperative Sanctuary Program for Golf, which certifies courses across six areas: environmental planning, wildlife and habitat management, chemical use reduction and safety, water conservation, water quality management, and outreach and education. Certification does not make a course virtuous by itself, but it does mean an outside body has reviewed the records.

The trade-off is real. Naturalized areas swallow golf balls, and the first season after a conversion is usually slower. The better projects keep the long grass out of the main landing zones.

Where players can help

• Repair two pitch marks per green. A mark fixed within minutes heals quickly; one left for days leaves a scar that needs more work to recover.
• Respect cart rules on wet spring ground. Compaction from traffic on soft turf is a major reason for the aeration you dislike.
• Fill divots with the sand mix provided and stay out of roped-off areas in April, when the turf is recovering from winter.
• Do not complain about tan fairways in August. It costs nothing and it supports the superintendent who is trying to use less.

What to ask at your club

• In Ontario: may I see the most recent annual report on pesticide use?
• In Quebec: how has the three-year reduction plan changed what is applied?
• Out West: where does the irrigation water come from, and what is cut first under restrictions?
• How is snow mould managed, and has the late-autumn programme changed in ten years?
• How much of the property is naturalized, and is the course enrolled in a certification program?

Canadian golf is played under some of the most detailed pesticide rules anywhere, and a short, cold season shapes almost every decision the maintenance crew makes. The superintendents doing this well generally have the numbers ready, and most are glad someone asked.