Pocket Gophers in Arizona: The Underground Destroyers

The desert pocket gopher (Geomys arenarius) and the plains pocket gopher (Geomys bursarius) are the primary gopher species causing yard damage in Pinal County. These solitary, fossorial rodents spend nearly their entire lives underground, excavating extensive tunnel systems that can extend 200+ feet and reach 6 feet deep. A single gopher can move 2,000+ pounds of soil per year.

Gopher damage is often confused with mole damage, but moles are not found in Arizona's desert climate. If you have raised mounds of loose soil in your yard, it's almost certainly a pocket gopher.

Identifying Gopher Damage

• Fan-shaped or crescent mounds: Gopher mounds are asymmetrical, with a plugged hole offset to one side. Mole mounds (not present in Arizona) are symmetrical with a central plug.
• Wilting or dying plants: Gophers sever plant roots from below. A plant that suddenly wilts and pulls out of the ground easily has had its roots eaten.
• Chewed irrigation lines: Gophers frequently chew through drip irrigation tubing, causing significant water waste and plant loss.
• Subsidence: Tunnel collapse creates depressions in the lawn and can damage hardscape.
• Tree damage: Gophers girdle tree roots and can kill established trees, particularly citrus and fruit trees common in Arizona yards.

Gopher Control Methods

Trapping: The Most Effective Method

Trapping is the gold standard for gopher control. The two most effective trap types are:

• Macabee trap: A wire pincer trap placed directly in the main tunnel. The most widely used professional gopher trap. Requires locating the main tunnel (not a lateral) and setting traps in pairs facing both directions.
• Black hole trap (Gophinator): A cylindrical trap that fits inside the tunnel. Easier to set correctly than Macabee traps and highly effective.

Trapping technique is critical. The main tunnel must be located by probing 6–12 inches from the mound with a gopher probe. Traps placed in lateral tunnels have poor catch rates. Check traps every 24 hours and reset as needed. Most active gophers are caught within 48 hours of correct trap placement.

Rodenticide Baiting

Zinc phosphide and anticoagulant baits (diphacinone, chlorophacinone) are effective when placed directly in the tunnel system. Bait is introduced through a probe hole into the main tunnel. Zinc phosphide acts within hours; anticoagulants require multiple feedings over several days. Bait stations must be placed underground to prevent non-target wildlife exposure. Professional application is recommended.

Fumigation

Aluminum phosphide gas tablets introduced into the tunnel system are highly effective but require a licensed pesticide applicator. The tunnel must be sealed after fumigant placement. Effective for large infestations or when trapping is impractical.

Underground Barriers

For protecting specific areas (vegetable gardens, tree root zones), hardware cloth (1/4-inch galvanized mesh) buried 18–24 inches deep with 6 inches bent outward at the bottom creates an effective physical barrier. This is labor-intensive but provides permanent protection for high-value plantings.

What Doesn't Work

Several popular DIY methods have little to no scientific support:

• Vibrating stakes and windmills — gophers habituate quickly
• Castor oil granules — minimal effect on established gophers
• Gopher plants (Euphorbia lathyris) — no controlled evidence of effectiveness
• Flooding tunnels — gophers simply plug the tunnel and wait
• Chewing gum — no evidence this harms gophers

Gopher Control Costs in Arizona

• Professional trapping service (per visit): $75–$150
• Monthly gopher control program: $60–$120/month
• Underground barrier installation (per linear foot): $8–$15
• Fumigation: $150–$400 depending on tunnel extent

Preventing Gopher Reinfestation

Gophers are territorial — a vacant territory will be colonized by neighboring gophers within weeks. Ongoing monitoring and rapid response to new mound activity is essential. Monthly professional service during the active season (spring and fall in Arizona) is the most reliable approach for yards with recurring gopher pressure.