What method is most effective for controlling ground squirrel populations in late winter and early spring?

Using fumigant rodenticides is considered the most effective method for controlling ground squirrel populations during late winter and early spring. During these seasons, ground squirrels are often in their burrows, which makes new fumigation methods particularly effective. Fumigants can penetrate these burrows, and when used correctly, they can quickly eliminate nests and populations that may not have been sufficiently affected by other methods. This technique minimizes the chance of ground squirrels repopulating the area as quickly as they might with other control methods.

While trapping can be effective, it often requires more time and may not significantly impact larger populations when they are active. Poisoned bait can also be effective, but it carries a risk of secondary poisoning to non-target species and may not reach animals that are deep underground. Repellents generally act as deterrents rather than direct control measures and may not provide the desired population reduction in a timely manner. Therefore, fumigant rodenticides stand out as the most suitable choice for effectively managing ground squirrel populations during these particular seasons.