
Prairie dog poison is on the rise, and it's not just a concern for wildlife enthusiasts. According to recent data, the number of prairie dog poisonings has increased significantly over the past decade.
The main culprit behind this trend is the use of brodifacoum, a highly toxic anticoagulant rodenticide. This substance is commonly used in bait stations to control rodents, but it's also highly lethal to prairie dogs.
Prairie dogs are particularly vulnerable to brodifacoum poisoning because they are at the top of the food chain. They feed on plants and insects, but also scavenge for carrion, which increases their exposure to the poison.
In areas where prairie dogs are poisoned, the entire ecosystem is affected. This can lead to a decline in biodiversity and even extinctions.
Prairie Dogs Face New Deadly Threat
Prairie dogs face a new deadly threat. The threat is not the traditional predators they've had for years, but rather a new poison that's been spreading rapidly across their habitats.
The poison is a type of rodenticide called brodifacoum, which is highly toxic to prairie dogs. It's often used to control rodent populations, but it's not safe for non-target species.
Prairie dogs are highly social animals that live in large colonies, often with complex social structures. They're also skilled diggers, creating extensive burrow systems that can be up to 30 feet deep.
Brodifacoum is particularly deadly because it can take weeks or even months for prairie dogs to die after ingesting it. This allows the poison to spread throughout the colony, causing widespread death and suffering.
In a study, researchers found that prairie dogs that ingested brodifacoum suffered from severe bleeding and hemorrhaging, often leading to death. The poison also caused liver and kidney failure in some cases.
Fumitoxin Rodent Poison
Fumitoxin Rodent Poison is a type of poison used to control prairie dog populations. It's a highly toxic substance that can be fatal to rodents.
Fumitoxin is typically applied to prairie dog burrows, where it's absorbed through inhalation. This can be a problem for other animals that may also use the burrows, such as ground squirrels and other small mammals.
If you're considering using Fumitoxin to control prairie dog populations, be aware that it's only effective for a short period of time and may require repeated applications.
Causes of the Threat
Fumitoxin Rodent Poison is a highly effective and widely used rodenticide, but its widespread use has led to a significant threat to the environment and human health. The main cause of this threat is the widespread availability of Fumitoxin in the market.
Rodent infestations are a major problem in many parts of the world, and Fumitoxin is often used as a quick fix. However, this can lead to secondary poisoning of non-target species, such as birds and other wildlife.
Fumitoxin is highly toxic to rodents, with an LD50 of 2-5 mg/kg, which means that even small amounts can be deadly. This makes it a particularly effective poison for controlling rodent populations.
On a similar theme: Strategies for Rodent Control

However, the widespread use of Fumitoxin has led to the development of resistant rodent populations, making it less effective over time. This has led to the need for repeated and frequent use of the poison.
Fumitoxin can also accumulate in the environment, contaminating soil and waterways, and posing a long-term threat to ecosystems.
What is Fumitoxin
Fumitoxin is a type of fumigant used to control prairie dog populations. It's a Restricted Use Pesticide, so users must have EPA private applicator certification to buy and use it.
Fumitoxin comes in tablet and pellet forms, specifically under the brand names Roton, Fumitoxin, or Phostoxin.
Efficiency for aluminum phosphide, the active ingredient in Fumitoxin, is usually 85–95%. This means that 85-95% of the prairie dogs in the treated area will be killed.
To apply Fumitoxin, you can use mechanical dispensers or apply it by hand using gloves.
How it Works
Fumitoxin Rodent Poison works by releasing a toxic gas that spreads throughout the burrow, killing the rodents. This gas is released when the bait is ingested by the rodent.

The bait is made of a non-toxic substance that the rodent finds appealing, which they then take back to their burrow.
The active ingredient in Fumitoxin is a potent toxin that is highly effective against rodents.
This toxin is released when the bait is ingested and mixed with the rodent's stomach acid, causing rapid death.
The gas released by Fumitoxin is colorless, odorless, and tasteless, making it undetectable to the rodents.
Fumigant Safety Concerns
Fumitoxin rodent poison can be extremely toxic if not handled properly, with a single grain capable of killing a rat weighing up to 1 pound.
Fumitoxin's toxicity is so potent that it can also be hazardous to humans, particularly if ingested or inhaled.
If you're working with Fumitoxin, it's essential to wear protective clothing and gloves to prevent skin contact and inhalation of the toxic fumes.
The vapors from Fumitoxin can cause severe irritation to the eyes, skin, and respiratory system, so make sure to work in a well-ventilated area.
Fumitoxin can also contaminate surfaces and objects, making it a risk to pets and other animals that may come into contact with the treated area.
Fumitoxin's toxic effects can be irreversible, so it's crucial to use caution and follow the recommended safety protocols when handling the product.
Toxicants
Toxicants can be an effective method for reducing or eliminating prairie dog colonies, with poison grain being 75-85% effective and costing around $10 per acre.
Poison grain typically comes in the form of ready-to-use baits containing zinc phosphide, which is the only bait registered for prairie dog control in New Mexico. You'll need to be certified to purchase and use it, so be sure to contact your county Extension office for more information.
The key to successful treatment is to pre-bait the colony with untreated grain before applying the toxic grain, as prairie dog acceptance of baits and toxicants can vary with weather, time of year, and other factors.
Here are the best times for control:
- Early spring immediately after the snow melt and thaw and during settled weather before green-up.
- Periods of dry, settled weather when vegetation is dry and dormant.
- After August 1 when prairie dogs are noticeably accepting more seeds and grains in their diet.
- During fall when food resources are in short supply and animals are “feeding up” for winter fat storage.
- On black-tail prairie dog colonies with limited space, over-crowding, and lack of food, treatment may be effective during periods of settled weather at any time of year.
Types of Toxicants
Prairie dogs can be quite resistant to toxicants, but with the right approach, you can increase their effectiveness.
One of the most practical and economical methods for reducing or eliminating prairie dog colonies is using toxicants. They're usually 75-85% effective and only cost about 10 dollars per acre.
Zinc phosphide is the only bait registered for prairie dog control in New Mexico, and it's a Restricted Use Pesticide, so you'll need to be certified to purchase and use it.
Zinc phosphide is available in both ready-to-use bait forms and a pellet form. It's also available in a 2% zinc phosphide-treated rolled oats form.
To ensure prairie dogs accept the toxic bait, you'll need to pre-bait the colony with untreated grain first. This will help them get used to the bait.
Pre-baiting involves dropping a heaping teaspoon of untreated rolled oats on the bare soil at the edge of each prairie dog mound or in an adjacent feeding area. The pre-bait should scatter, forming about a 6-inch circle.
Here are the best times for control using grain baits:
- Early spring immediately after the snow melt and thaw and during settled weather before green-up.
- Periods of dry, settled weather when vegetation is dry and dormant.
- After August 1 when prairie dogs are noticeably accepting more seeds and grains in their diet.
- During fall when food resources are in short supply and animals are “feeding up” for winter fat storage.
- On black-tail prairie dog colonies with limited space, over-crowding, and lack of food, treatment may be effective during periods of settled weather at any time of year.
Effects on Prairie Dogs
Prairie dogs are highly susceptible to toxicants due to their herbivorous diet and social behavior. They often cache seeds and plants, which can lead to accumulation of toxic compounds in their bodies.
The ingestion of toxicants can cause a range of health problems in prairie dogs, including liver damage and reproductive issues.
Prairie dogs are also highly social animals, living in complex societies with strict hierarchies. This social structure makes them more vulnerable to the impacts of toxicants, as they are more likely to be exposed to contaminated food and water sources.
The presence of toxicants in prairie dog colonies can lead to a decline in population size and even local extinctions.
Fumigants
Fumigants can be a more expensive option, costing 5 to 10 times more per acre than poison-grain baits.
Fumigants require greater care and safety in application, and need at least twice the application time and labor as grain baits.
They cost 15 to 35 cents per burrow compared to 5 cents per burrow for grain baits.
Fumigants come in several forms, including aluminum phosphide in tablet or pellet form, and gas cartridges, also known as "smoke bombs".
Aluminum phosphide is usually 85-95% efficient, while gas cartridges provide only 35-65% efficiency.
To apply aluminum phosphide, use gloves and plug the hole tightly with sod after applying the fumigant.
Gas cartridges are convenient and relatively safe to use, and are not a Restricted Use Pesticide.
To apply gas cartridges, ignite the fuse and insert the cartridge into the burrow, then plug the hole tightly.
Fumigants work best in moist soils, where the soil seals the burrow and causes a lethal dosage.
Fumigant controls can kill non-target animals within treated prairie dog holes, but usually don't affect surface animals.
See what others are reading: What Animals Eat Prairie Dogs
Frequently Asked Questions
What diseases can prairie dogs give humans?
Prairie dogs can transmit sylvatic plague to humans through contact with the animals or their fleas, which can be fatal if left untreated
What is the best prairie dog poison?
The most effective prairie dog poison is an anticoagulant, specifically chlorophacinone or diphacinone, which is commonly used in winter baiting programs.
Sources
- https://liphatech.com/farm-ranch/products/rozol-prairie-dog-bait/
- https://www.audubon.org/magazine/november-december-2009/doggone-prairie-dogs-face-new-and
- https://defenders.org/blog/2019/05/poison-prairie
- https://www.denver7.com/news/front-range/highlands-ranch/pesticide-that-killed-two-utah-girls-used-across-from-highlands-ranch-school
- https://pubs.nmsu.edu/_l/L201/index.html
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