Sep 9, 2026

Pesticides in Mauritius: Addressing the Risks of "Silent Killers"

Agriculture, Public Health and Environmental Protection

Pesticides in Mauritius: Addressing the Risks of “Silent Killers”

Mauritius has established important legal controls on pesticides, but weaknesses in traceability, monitoring and enforcement continue to expose agriculture, public health and the environment to long-term risks.

Pesticides support agricultural production by controlling insects, plant diseases and weeds. When properly selected and responsibly applied, they can reduce crop losses and help farmers maintain reliable yields.

However, pesticides can also create risks that are difficult to see. Chemical residues may remain in food, soil and water without producing an immediate warning. Their effects may emerge only after repeated exposure over many years.

This is why the Office of the Director of Public Prosecutions has used the expression “silent killers” when discussing pesticides. The term draws attention to forms of harm that may develop gradually and remain unnoticed until they become serious or irreversible.

Key message

The central challenge is not whether pesticides should be regulated, but whether Mauritius can trace their movement, control their application and detect harmful residues before damage reaches consumers and ecosystems.

Why pesticides are called “silent killers”

Acute pesticide poisoning may cause visible effects such as skin irritation, burns, nausea or breathing difficulties. Chronic exposure is more difficult to recognise because it may involve repeated contact with small quantities quantities over a period of years.

Consumers cannot normally see, smell or taste pesticide residues. This invisible exposure makes prevention, testing and traceability especially important.

Chronic exposure

Small and repeated exposures may accumulate over many years before serious health effects become apparent.

Nervous system effects

Some pesticides interfere with biological mechanisms involved in nervous system signalling, creating concerns for non-target organisms and people.

Multiple residues

A meal may contain produce treated with several substances, creating potential exposure to a mixture or “cocktail” of chemical residues.

The health effects of pesticides depend on the chemical involved, the dose, the route of exposure and the duration of contact. Certain substances have been associated with neurological effects, endocrine disruption, reproductive harm or increased cancer risks.

The agricultural consequences are equally important. Excessive or inappropriate pesticide use can reduce beneficial soil organisms, including earthworms and microorganisms that contribute to soil fertility. Chemicals may also move through the soil, enter groundwater or be carried into rivers and coastal ecosystems.

A small-island vulnerability

Mauritius has limited land and freshwater resources. Contamination originating on agricultural land can therefore affect drinking-water reserves, aquatic life, coastal environments and communities located far beyond the original application site.

The Mauritian legal framework

Pesticide control in Mauritius is distributed across several laws and enforcement agencies. Each law addresses a different stage in the movement of chemicals from importation to agricultural use and, ultimately, to food sold to consumers.

Legislation	Main focus	Possible consequences
Dangerous Chemicals Control Act	Importation, classification, licensing, labelling, packaging, storage and distribution of dangerous chemicals	Fines, imprisonment, prohibition notices and seizure or destruction of prohibited chemicals
Use of Pesticides Act 2018	Agricultural application of pesticides and control of pesticide residues in produce intended for sale	Increasing fines for repeated offences and possible imprisonment
Food Act and Food Regulations	Safety of food offered to consumers and compliance with Maximum Residue Levels	Enforcement action against parties placing unsafe or non-compliant food on the market
Environment Act 2024, as amended in 2026	Serious environmental offences, including the criminal offence of ecocide under Section 135A	Proportionate fines, penal servitude, environmental restoration, compensation and recovery of clean-up costs

The Dangerous Chemicals Control Act requires licences for activities such as importing, manufacturing, selling, storing and distributing dangerous chemicals. Importing or exporting a pesticide or an extremely dangerous chemical also requires a permit.

Chemical labels and safety documentation play a central role in this system. Appropriate information should identify the hazards associated with a product, the precautions required during use and the conditions under which it should be stored.

The Use of Pesticides Act focuses specifically on agricultural application. The Food Act and its regulations provide an additional level of protection by controlling the pesticide residues permitted in food offered to consumers.

Effective protection depends on these laws operating as one connected system. Regulation at the border has limited value if authorities cannot subsequently determine where, when and how the imported chemical was used.

Are pesticide lists keeping pace with scientific evidence?

The schedules attached to chemical legislation identify substances subject to control and those whose importation, manufacture, use or possession is prohibited without written authorisation.

Concerns have been raised that these lists have not been updated frequently enough to reflect new scientific findings and international regulatory decisions. Some substances permitted or controlled in Mauritius may already be prohibited or no longer recommended in other jurisdictions.

International decisions should not automatically replace a national risk assessment. Mauritius has its own crops, climate, pests and production conditions. Nevertheless, when another jurisdiction prohibits a pesticide because of credible health or environmental evidence, that decision should trigger a timely scientific review in Mauritius.

A stronger review process should consider:

New evidence on toxicity and long-term exposure
Risks to groundwater, soil organisms and aquatic ecosystems
Decisions taken by international regulatory authorities
Whether safer and economically viable alternatives are available
The agricultural necessity of retaining a particular substance

The critical traceability gap

The briefing highlighted the importation of approximately 3,100 tonnes of pesticides during 2025. However, the quantity imported does not reveal where these chemicals were applied, which crops received them or whether the volume used was proportionate to the area cultivated.

Mauritius does not yet have a complete system capable of tracing every pesticide from its point of importation to the individual field where it is applied.

A credible traceability system should record:

The chemical and quantity imported
The importer, distributor and final purchaser
The crop and field on which the chemical was applied
The dose, application date and person responsible
The interval between application and harvesting
The management of unused products and empty containers
The results of any residue tests conducted on the produce

Digital records could allow authorities to compare the quantity purchased with the size of the cultivated area. A disproportionately high volume could automatically generate a warning and trigger an inspection.

Traceability would shift pesticide regulation from investigating damage after it occurs to identifying high-risk practices before contaminated produce reaches consumers.

Sampling and monitoring remain limited

Mauritius produces a substantial quantity of food crops each year. The briefing reported annual production of approximately 180 million kilograms, compared with around 800 pesticide-residue samples.

The figures illustrate the difficulty of drawing conclusions about the safety of an entire food system from a relatively small number of tests. Sampling cannot cover every farm or consignment, but it should be sufficiently broad and strategically targeted to identify areas of greatest risk.

High-risk crops

Prioritise produce with a history of non-compliance, intensive chemical treatment or frequent raw consumption.

Local and imported food

Apply comparable food-safety expectations to locally produced and imported fruits, vegetables, spices and other products.

Rapid results

Improve laboratory turnaround times so that perishable produce is not sold before a non-compliant result becomes available.

Monitoring should include imported produce as well as local crops. Fruits such as grapes and oranges, together with dried products and spices, may also carry residues and should form part of a risk-based testing programme.

Laboratory capacity is another challenge. Fresh produce is highly perishable, and test results may not always be available before the food has been distributed or consumed. Faster analytical methods and clear procedures for holding high-risk consignments could help address this weakness.

Illegal practices and enforcement concerns

Effective regulation must also address the possibility that restricted or prohibited substances continue to circulate. The detection of an unauthorised pesticide may result from illegal importation, incorrect documentation, old stocks or misuse of a product on a crop for which it was not approved.

Concerns have also been raised about farmers allegedly reserving small, minimally treated plots for household consumption while using heavier pesticide treatments on crops intended for sale. Although such claims require evidence and should not be generalised to the farming community, they demonstrate why independent monitoring is necessary.

Farmers who comply with the law may also be placed at an economic disadvantage when illegal products or unsafe practices reduce the production costs of non-compliant competitors. Strong enforcement therefore protects responsible producers as well as consumers.

Responsibility is shared across several institutions

Ministry responsible for agriculture: safe pesticide use, farm inspections and monitoring of residues in agricultural materials
Ministry responsible for health: health effects of chemical exposure and food-safety controls
Ministry responsible for labour: occupational exposure, chemical storage and workplace safety
Police: road transport of dangerous chemicals and emergency preparedness
Fire and Rescue Service: chemical spills, fires, explosions and loss-of-containment incidents

Divided responsibilities make coordination essential. Inspection data, import records, residue results and information about environmental incidents should be shared through a common national system.

Ecocide and the new legal frontier

Mauritius introduced the criminal offence of ecocide through a 2026 amendment to the Environment Act 2024. Section 135A entered into force on 18 April 2026.

Under the amended legislation, ecocide involves an unlawful or wanton act committed with knowledge that there is a substantial likelihood of causing damage that is severe and either widespread or long-term.

Severe

Damage involving very serious adverse changes, disruption or harm to an element of the environment.

Widespread

Damage suffered by an entire ecosystem or species, or by a large number of people.

Long-term

Damage that is irreversible or cannot be repaired through natural recovery within a reasonable period.

Wanton

Conduct showing reckless disregard for damage that is clearly excessive in relation to the anticipated social and economic benefits.

A person convicted of ecocide may face penal servitude for up to ten years. Financial penalties are intended to reflect the gravity and duration of the damage, the offender’s circumstances and any financial benefit obtained from the offence.

Courts may also order environmental restoration, compensation and recovery of clean-up costs. Permits may be withdrawn, and a convicted person may be excluded from certain forms of public funding.

Ecocide does not criminalise ordinary farming

The offence sets a very high threshold. An isolated mistake or ordinary regulatory violation would not automatically amount to ecocide. In an extreme case, however, the deliberate or recklessly excessive release of a hazardous chemical causing severe and widespread ecosystem destruction or irreversible groundwater contamination could potentially attract scrutiny under Section 135A.

Moving from chemical dependence to agroecology

Enforcement alone cannot resolve the problem. Farmers also need practical alternatives that allow them to protect crops without jeopardising their income.

Agroecology and integrated pest management seek to reduce unnecessary chemical treatments by combining biological, ecological and agricultural methods.

Regular field observation before deciding to spray
Crop rotation and greater on-farm diversity
Resistant crop varieties
Biological control of pests
Mechanical and cultural weed management
Protection of beneficial insects and soil organisms
Use of validated biopesticides where appropriate

A successful transition must be gradual and supported by research, training, extension services and financial incentives. Farmers should not be expected to abandon an effective treatment without access to a safe, affordable and reliable alternative.

Five priorities for Mauritius

Introduce digital traceability. Track pesticides from importation and sale to their application on individual farms and crops.
Increase risk-based sampling. Direct limited laboratory resources towards high-risk produce, previously non-compliant operators and vulnerable consumer groups.
Review pesticide lists regularly. Establish a transparent procedure for assessing new scientific evidence and international regulatory decisions.
Strengthen licensing and training. Ensure that pesticide applicators understand dosage, protective equipment, storage, pre-harvest intervals and container disposal.
Support agroecological alternatives. Connect regulation with research, farmer education, financial incentives and access to safer pest-management tools.

The role of universities

Universities can make an important contribution by connecting agricultural science, public health, environmental monitoring and legal analysis.

Research institutions can evaluate pesticide residues in food, soil and water; assess the effectiveness of safer alternatives; help design digital traceability systems; and provide independent evidence to policymakers.

Universities can also contribute to farmer education and public awareness. Communication should remain balanced: pesticides should neither be presented as harmless nor discussed in ways that create unnecessary fear. The objective is to promote informed decisions based on evidence, proportionality and prevention.

From invisible risk to preventive action

Mauritius already possesses much of the legal foundation required to regulate pesticides. The central weakness lies in the distance between the law as written and its consistent implementation across the agricultural and food supply chains.

More extensive monitoring, faster laboratory results, updated chemical lists and complete traceability would allow authorities to identify risks before they become public-health or environmental crises.

Protecting Mauritius from the silent effects of pesticides requires more than penalties. It requires a coordinated system that supports responsible farmers, protects consumers and prevents irreversible damage to the country’s soil, water and biodiversity.

From Pesticide Control to Ecocide: Mauritius’ Changing Approach to Agricultural Chemicals

How Mauritius can protect agricultural productivity while responding more effectively to chemical risks, food-safety concerns and long-term environmental damage.

Responsible pesticide management requires appropriate protective equipment, careful application and effective farmer training.

Agricultural chemicals have played an important role in maintaining crop productivity and protecting farmers’ livelihoods in Mauritius. Yet their benefits must be weighed against their potential effects on human health, soil quality, biodiversity and water resources.

This challenge is particularly significant for a Small Island Developing State. Mauritius has limited land and freshwater resources, while farming, housing, industry and tourism operate within a closely connected environment. Chemicals applied in one place may therefore have consequences extending far beyond the farm on which they were used.

Mauritian law is beginning to reflect this wider understanding of environmental responsibility. Alongside legislation governing dangerous chemicals, pesticide use and food safety, the country has now introduced the criminal offence of ecocide for exceptionally serious environmental harm.

The central question

How can Mauritius continue to support productive farming while preventing chemical use from creating lasting environmental and public-health costs?

A regulatory system built around three areas of protection

The regulation of agricultural chemicals in Mauritius is distributed across several laws and public authorities. Three statutes are especially important.

Legislation	Main focus	Key responsibilities
Dangerous Chemicals Control Act	Importation, manufacture, distribution, storage and handling of dangerous chemicals, including pesticides	Licensing, import permits, classification, packaging, labelling and safety information
Use of Pesticides Act 2018	Use of pesticides in agricultural production	Authorised pesticide use, application requirements and control of residues in agricultural produce
Food Act and Food Regulations	Safety and quality of food placed on the market	Limits for pesticide residues and protection of consumers from contaminated food

The Dangerous Chemicals Control Act requires licences for activities such as importing, manufacturing, selling, storing and distributing dangerous chemicals. Separate permits are required for importing or exporting pesticides and chemicals classified as extremely dangerous.

The Act also establishes requirements relating to packaging, safety data sheets and the communication of chemical hazards. Enforcement responsibilities are shared among several agencies, including the ministries responsible for health, agriculture and the environment.

The Use of Pesticides Act focuses more specifically on agricultural practice. It seeks to ensure that pesticides are used only under authorised conditions and that residues in harvested produce remain within permitted Maximum Residue Levels, commonly known as MRLs.

Food legislation completes the chain by regulating the safety of products reaching consumers. Mauritius’ Food Regulations provide that pesticide residues must not exceed the applicable limits established through the Codex Alimentarius pesticide-residue database.

Together, these laws are intended to regulate the entire pathway—from chemical importation and agricultural application to the sale and consumption of food.

Where the system remains vulnerable

The existence of legislation does not automatically guarantee effective protection. Several weaknesses deserve closer attention.

One concern is whether the schedules and authorised-substance lists attached to older chemical legislation are being updated rapidly enough to reflect current scientific evidence and international regulatory decisions.

If chemicals remain authorised locally after stricter jurisdictions have prohibited or discouraged their use, farmers, consumers and ecosystems may be exposed to risks that newer alternatives could reduce.

The Dangerous Chemicals Control Act also permits written authorisation for the importation, manufacture, possession or use of a prohibited chemical, following a favourable recommendation from the Dangerous Chemicals Advisory Council.

Such flexibility may occasionally be necessary—for example, where no technically viable substitute exists—but it should be supported by clearly defined criteria, documented risk assessments and transparent reporting. Without these safeguards, exceptional authorisations risk weakening the credibility of the general prohibition.

Another challenge is fragmented responsibility. Different authorities oversee chemical importation, agricultural use, workplace safety, environmental contamination and food residues. Effective regulation therefore depends on timely information-sharing and coordinated enforcement across institutions.

Why pesticide residues are described as “silent killers”

Acute pesticide poisoning may produce immediate and recognisable symptoms. Chronic exposure is more difficult to identify because residues may be colourless, odourless and impossible for consumers to detect.

The greatest concern is not necessarily a single meal or isolated exposure. It is the possibility of repeated exposure to mixtures of residues over many years. Depending on the substance, dose and duration, such exposure may be associated with neurological, reproductive, endocrine or carcinogenic effects.

Why Carbendazim attracts concern

Carbendazim illustrates the importance of reviewing pesticide approvals as scientific knowledge develops. The substance has attracted international concern because of its potential mutagenic, reproductive and developmental effects. Its presence in food or the environment is therefore not simply a technical compliance issue; it raises broader questions about preventive public-health policy.

The issue also extends beyond food residues. Large quantities of herbicides and other agricultural chemicals are used in crop production, including within the sugar-cane sector. If storage, application or disposal practices are poorly controlled, these substances may enter soils, rivers and groundwater.

For Mauritius, groundwater contamination is especially serious. Once persistent chemicals reach an aquifer, removing them may be technically difficult, expensive or, in some cases, impossible within a meaningful timeframe.

Agricultural chemical management must protect not only crops, but also soil health, biodiversity and Mauritius’ groundwater resources.

The traceability gap

A modern pesticide-control system should be able to answer several basic questions:

Which chemical was imported?
Who purchased it?
On which crop and field was it applied?
What quantity was used?
When was the crop harvested?
How were unused products and empty containers managed?
Did residue testing confirm compliance before the produce entered the market?

Available information does not always create a complete path from importation to final use. Mauritius would benefit from a national digital traceability system linking chemical imports, licensed sellers, trained applicators, farm acreage, crops and application volumes.

Such a system could automatically identify unusual patterns. If the amount of a pesticide purchased or applied appears excessive in relation to the cultivated area, the case could be flagged for inspection before contamination occurs.

This would represent an important transition from reactive enforcement to risk-based prevention.

Sampling must be proportionate to the food system

Residue testing is an essential part of consumer protection, but its value depends on the number of samples, where they are collected and how intelligently they are selected.

The Pesticides Regulatory Office publishes results for samples collected from farms, auction markets, supermarkets, retailers and imported consignments. These reports provide valuable information, but a relatively small testing programme cannot, by itself, provide complete assurance across the national food supply.

Testing should increasingly be targeted according to risk. Priority could be given to:

Crops with a history of non-compliance
Produce commonly eaten raw
Food consumed frequently by children
Farms or importers associated with previous violations
Chemicals presenting particularly serious health hazards
Commodities for which pesticide use is unusually intensive

Published results should also distinguish clearly between residues that exceed a numerical MRL and substances that are not authorised or recommended for a particular crop.

Ecocide changes the legal frontier

Mauritius introduced the offence of ecocide through a 2026 amendment to the Environment Act 2024. The provision entered into force on 18 April 2026.

Section 135A defines ecocide as an unlawful or wanton act committed with knowledge that there is a substantial likelihood of causing damage that is severe and either widespread or long-term.