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Kneehill County Ag Services News

Posted on: March 29, 2022

Richardson's Ground Squirrel Control

Controlling RiRichardson Ground Squirrelschardson’s Ground Squirrels (RGSs) can be challenging in any year. Timing is the key to efficient control. April is generally the best month for controlling RGSs as they emerge earlier or later in the spring depending on the amount of snow. Control should be initiated prior to the emergence of the young when the males first emerge above ground and before the females go underground to have their litters.

Options for control include shooting, use of rodenticides and non-chemical means. 

Shooting is a very effective method for control, especially when the males first emerge as they are living off their winter body fat and fighting for territories. The females emerge two weeks after the males and breed immediately. Targeting the breeding males and females can have a significant reduction in the population of RGSs in any given year. 

There are rodenticides labelled to control RGSs; however, misuse of these products may result in non-target poisonings. Strychnine is the best-known product as it is a single feeding product; the registration for use of this product will be ending March 4, 2023, by Health Canada. Rozol® is another effective product that is available and requires multiple feedings. The key is to put the rodenticides out after mating and before crops emerge as RGSs will choose a fresh crop over grain. 

There are a few other rodenticides that are available, check with your local agricultural fieldman to see if these products may be suitable for you. 

There are a variety of non-chemical controls that can be used without the risk of secondary poisonings. Platforms for raptors (carnivorous birds) in treeless areas encourage them to nest and should be set up for a period of time before nesting to allow the birds to become familiar with them. They can be as simple as two large round bales set on end with one on top of the other, or a more permanent structure.

One pair of nesting ferruginous hawks can consume up to 500 RGSs in a season. The local electricity distributor in your area may have a program to provide poles for constructing platforms. Hawk Nest

Other options for non-chemical control include cultivating fields to destroy burrows and mounds, leaving field margins tall to allow for predators such as foxes to den, and leaving grass tall on fence lines for coyotes and weasels to hunt RGSs. Rotating crops, cleaning up spilled grain, and removing hiding places such as boards or garbage can be effective. 

There is no one effective control for RGSs; a multi-pronged approach must be taken every year incorporating different methods of control. 

-Karen Wickerson, Rat and Pest Program Specialist,  
AB Agriculture, Forestry, and Rural Economic Development

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