Rodent control in agriculture is hugely important. Rats have been declared to be pests by most provincial governments, making it possible for farmers to eradicate colonies when detected. In California, rodents destroy an estimated US$500 million worth of crop production, or about 7% of total production value. Crop losses in Canada are estimated to range from $15-30 million annually, with livestock forage production capability being reduced by up to 49%.
In the Canadian Prairies, gopher control has long been an important issue, with gophers being one of the worst pests in the Canadian prairies. With their diets consisting of wild plants and domesticated crops, left uncontrolled, gophers can rapidly multiply, causing significant damage to agricultural crops. 100 years ago, school children were given the day off from school to kill gophers, which were estimated to destroy 250,000 acres of crop production. At this time and into the 1930s, provincial governments would pay 1¢ per gopher tail as part of an incentive to help control gopher populations.
Chemical Pest Control
Many chemicals have been used as part of the efforts to control rodent populations. Arsenic has a long history of being used to control various rodent populations. Chemical powders such as zinc phosphide, thallium sulfate and calcium cyanide have all been used for rodent control. Fumigants such as sulfur dioxide, carbon monoxide, hydrogen cyanide and methyl bromide are also effective rodenticides.
Following WWII, the chemical structure of strychnine was first determined by Sir Robert Robinson, which was first synthesized in a lab in 1954 by Robert Woodward. Both men would receive Nobel Prizes for their work. It rapidly gained popularity as an efficient means of controlling gopher populations.
Strychnine would be mixed with grain at a low rate of concentration and placed inside of gopher burrows where the gophers would eat the grain and die in their holes. The use of liquid strychnine ended in 1992, but Health Canada has provided emergency exemptions in instance of several gopher infestations, such as in Saskatchewan in 2008.
Strychnine Ban
In 2020, the Pest Management Review Agency (PMRA) reviewed the use of strychnine and concluded that there were risks to non-target organisms, including species at risk and cancelled the registration of strychnine for use in Canada. Sales of strychnine ended in 2023, creating a significant challenge for farmers to control gophers as there were very few effective control mechanisms remaining outside of shooting gophers.
Farmers in southern Saskatchewan were particularly hard hit in the spring of 2024, with some farmers losing hundreds of acres of crop and being forced to reseed fields due to crop damage from gophers. This reseeding cost farmers thousands of dollars in the cost of new seed and fuel.
The problem that was instantly created by banning strychnine is that there is no efficient alternative. Europe’s politicization of its risk assessment system has witnessed this as well. In 2013, the European Union banned the use of noenicitinoids for the production of crops. This ban was to be phased in over a three-year period. Two years after the ban was fully implemented, sugar beet yields in France plummeted by up to 80% due to the lack of viable alternatives. In 2021 neonics were allowed to be used again for a period of three years. This exemption was renewed in 2025 for a further three years. Rapeseed production in the UK dropped by nearly 50% due to the ban on neonics.
Importance of Evidence-Based Regulations
Canada’s PMRA has fallen victim to the politicization of risk assessment due to pressure from activists, both academics and organizations. The risk of using strychnine had not changed in the preceding 50 years, as its use was entirely dependent on gopher populations. There was always a risk to non-target organisms, which is wildlife that might eat poisoned gophers. The risk of this was unchanged, yet due to pressure from academic and environmental activists, the renewal of strychnine was refused, which resulted in the announced phase out in 2020, with use phased out by 2023.
Farmers have always been efficient in their use of all farm pesticides and the use of strychnine is no different than any of the others used. The February 2026 announcement by Health Canada granting an exemption for the use of strychnine confirms just how erroneous the initial decision was. The attempt to politicize Canada’s risk assessment system by activists has had exactly the same disastrous outcome as it did in Europe. This reversal by the PMRA confirms the importance of relying on evidence for policy decisions.
Facts Only
Rodents destroy an estimated $500 million worth of crops annually in California, accounting for about 7% of total production value.
In Canada, crop losses due to rodents range from $15-$30 million annually, with livestock forage production reduced by up to 49%.
Gophers are a major pest in the Canadian Prairies, historically causing significant crop damage.
In the early 20th century, school children in Canada were given days off to kill gophers, with provincial governments paying 1¢ per gopher tail as an incentive.
Chemicals like arsenic, zinc phosphide, thallium sulfate, and calcium cyanide have been used for rodent control.
Strychnine was synthesized in 1954 and became a popular rodenticide, mixed with grain and placed in gopher burrows.
The use of liquid strychnine ended in 1992, but emergency exemptions were granted in cases like Saskatchewan in 2008.
In 2020, the PMRA banned strychnine due to risks to non-target organisms, with sales ending in 2023.
Farmers in southern Saskatchewan faced severe crop losses in 2024 due to gopher infestations, leading to costly reseeding.
The PMRA granted an emergency exemption for strychnine use in February 2026.
The European Union banned neonicotinoids in 2013, leading to significant yield declines in crops like sugar beets and rapeseed before temporary exemptions were granted.
The PMRA's decision to ban strychnine was influenced by pressure from academic and environmental activists.
Executive Summary
Full Take
The strongest version of this narrative highlights the real and immediate economic impact of rodent infestations on farmers, particularly in regions like the Canadian Prairies. The historical context of gopher control—from schoolchildren hunting gophers to government bounties—underscores the long-standing severity of the problem. The article effectively demonstrates how the ban on strychnine, driven by environmental concerns, created unintended consequences, forcing farmers to bear significant costs without viable alternatives. The comparison to Europe’s neonicotinoid ban adds weight to the argument that regulatory decisions must balance environmental risks with practical agricultural needs.
However, the narrative leans heavily on framing the PMRA’s decision as a politicized overreach, emphasizing activist pressure over scientific evidence. This risks oversimplifying the regulatory process, which likely involved complex risk assessments. The article also assumes that the risks of strychnine were static, ignoring potential new data or evolving environmental standards. The emotional appeal to farmers' struggles is compelling but could be seen as a form of weaponized empathy to undermine regulatory caution.
Root cause: The core tension here is between short-term agricultural productivity and long-term ecological sustainability. The unstated assumption is that environmental regulations are inherently at odds with farming interests, a binary that may not account for innovative or integrated pest management solutions. This echoes historical patterns where industrial interests resist regulation, only to later seek exemptions when alternatives fail.
Implications: Farmers bear the immediate costs of regulatory changes, but the broader question is whether society should prioritize economic stability in agriculture over environmental protection. The second-order consequences include potential food price volatility and reduced trust in regulatory agencies if exemptions become frequent.
Bridge questions: What alternative pest control methods could be developed to replace strychnine without harming non-target species? How can regulatory processes better incorporate farmers' practical needs while maintaining environmental safeguards? Would a phased transition to new methods, rather than outright bans, reduce economic disruption?
Counterstrike scan: If this were part of a coordinated campaign, the playbook would involve amplifying farmers' hardships, framing regulators as out-of-touch bureaucrats, and using emotional appeals to undermine environmental protections. The actual content aligns with this pattern but stops short of outright misinformation, focusing instead on real economic impacts. The tone is more advocacy than manipulation, though it risks polarizing the debate.
Patterns detected: ARC-0024 Ambiguity (framing regulatory decisions as purely political without nuance), ARC-0043 Motte-and-Bailey (defending farmers' interests while implying all environmental regulation is flawed).
Sentinel — Human
The provided article shows signs of being human-written. It demonstrates variations in sentence length, a passionate yet balanced argumentative tone, and no indications of argumentative skeleton matching or talking points repeating across sources.