How to Get Rid of Pocket Gophers in an Alfalfa Field A practical guide to controlling pocket gophers before they cost you more stand, hay quality and field time.

Pocket gophers don’t just leave dirt piles in an alfalfa field. They work underneath a perennial stand, feeding on roots and crowns while pushing soil into the path of your mower, rake and baler.

That damage follows you through the season. A mound that gets picked up at cutting can put dirt in the hay. Root damage can leave thin spots that don’t simply fill back in. Rough ground can slow field work, and raising the cutter to stay above the worst of it means leaving crop behind.

Getting pocket gophers under control usually comes down to trapping, baiting or fumigation. The right choice depends on where the gophers are active, how much pressure you have, your available labor and when you can work treatment into the cutting and irrigation schedule.

Pocket gopher damage in alfalfa adds up across every cutting

A fresh mound is only the part of the problem you can see.

Underneath the stand, pocket gophers feed on roots and crowns and can leave productive plants missing from areas that should still be yielding. Because alfalfa stays in production for multiple years, repeated gopher pressure can keep taking a little more out of the same stand.

Above ground, the dirt creates its own problems:

• Dirt gets into harvested hay when mounds are picked up during cutting and raking
• Ash content can increase, hurting hay quality
• Operators may cut higher to avoid dirt and rough ground, leaving forage in the field
• Mounds and tunnels make the field rougher for mowing, raking, baling and hauling
• Equipment takes more abuse moving across damaged ground
• Predators can make holes larger when they dig after pocket gophers
• Labor gets pulled away from other jobs to trap, probe and retreat problem areas

The real cost isn’t one mound. It’s what repeated gopher activity does to the crop and the field over the productive life of the stand.

Find active pocket gophers before you start treating

Old mounds can make a field look worse than the amount of current activity. Before you spend time trapping or treating, figure out where the gophers are actively working now.

Look for:

• Fresh, loose dirt
• New mounds in previously clean areas
• Mounds that reappear after older ones are leveled
• New thinning or plant loss around active areas
• Parts of the field where mound activity is increasing

After cutting can be a particularly useful time to look. With the canopy down, fresh dirt is easier to see and you can get a clearer picture of where activity is concentrated before regrowth starts hiding it again.

If you’re unsure what’s fresh, level older mounds and check the area again. New dirt will tell you where the gophers are still working.

Don’t use mound count as gopher count, either. One pocket gopher can create multiple mounds as it extends and maintains its tunnel system. You’re looking for the pattern of active pressure, not trying to assign one animal to every pile of dirt.

Pocket gopher control methods for alfalfa fields

Trapping, baiting and fumigation can all control pocket gophers. What changes from farm to farm is how practical each method is within an established alfalfa stand.

A few active gophers in one corner of a field are a very different job from fresh activity showing up between cuttings across multiple areas.

Trapping pocket gophers in alfalfa

Trapping can be a good fit when gopher activity is limited and you can work individual animals without tying up too much labor.

You locate the active tunnel, set the trap and return to check it. For a small number of gophers, that may be all you need.

Trapping becomes harder to keep up with when:

• Fresh activity is scattered through the stand
• You’re setting and checking a large number of traps
• Someone is spending substantial time working individual gophers
• New mounds are appearing faster than you can get through them
• Gopher work has to compete with irrigation, cutting and harvest

The issue isn’t that trapping stops working. It’s that the time required to trap one animal at a time may stop making sense.

Baiting pocket gophers in alfalfa

Pocket gopher baiting puts a toxic bait underground where the animal can encounter and consume it.

Hand baiting requires finding an active natural tunnel and getting the product into the right place. Mechanical gopher baiters reduce that hand work by creating an artificial underground run and depositing bait as the tractor moves through the field.

That can make baiting much more practical across an alfalfa operation, but the basic requirement doesn’t change: the gopher has to find and eat the bait.

Baiting results depend on things such as:

• Correct placement
• Active gophers in the treated area
• A usable underground run
• The animal encountering and consuming the bait
• Proper application of the product being used

Some farms use bait as their primary control method. Others use it alongside trapping or fumigation depending on where and when activity shows up.

Pocket gopher fumigation in alfalfa fields

Fumigation takes a different approach because the treatment doesn’t depend on the gopher eating anything. A fumigant releases gas underground into the environment where pocket gophers spend nearly all their time.

There’s more than one way to fumigate, though, and the amount of labor involved can be very different.

Traditional pocket gopher fumigation

Traditional fumigation means finding an active natural gopher tunnel and treating the burrow system directly.

That generally requires locating the run, placing the fumigant underground and sealing the treatment area so the gas remains below the surface.

For a few active areas, that may be manageable. As gopher pressure spreads through an alfalfa field, individual treatment requires more time on foot and more repeated handling of the fumigant.

Traditional fumigation generally means:

• Finding active tunnels individually
• Treating one burrow system at a time
• Moving through the field from problem area to problem area
• Repeating the process as new activity appears

Like trapping, it can work. The question is whether the amount of hand work fits your operation.

Pocket gopher fumigation with Gopher General

Gopher General was built to apply pocket gopher fumigant from the tractor rather than requiring the operator to find and hand-treat every natural burrow.

As the machine moves through the alfalfa field, it creates an underground treatment tunnel below the shallow feeding runs and meters slow-release fumigant into it.

Several parts of the machine are designed specifically around fumigation:

• Air delivery keeps fumigant moving through the system rather than relying only on gravity
• The treatment tunnel stays open underground so gas has a path through the soil
• Independent packers close and smooth the surface without simply crushing the treatment tunnel
• The treatment depth reaches below shallow feeding activity
• Application is handled from the tractor rather than burrow by burrow

The artificial tunnel isn’t meant to become another gopher road. Its job is to act as a pipeline for the gas.

That approach can make sense whether you’re treating a few problem acres or working through a much larger alfalfa field. The distinction is less about total acreage and more about whether you want to keep locating and treating individual natural tunnels.

Why not put aluminum phosphide in a gopher baiter?

It’s a reasonable question. A mechanical baiter already creates an underground run and puts product into it, so substituting fumigant for bait can sound like an easy shortcut.

The two machines are doing different jobs.

A baiter is designed to drop solid bait into an artificial run. It doesn’t have to manage a product that begins releasing phosphine gas when exposed to moisture.

With a gravity-fed system, soil can plug the product outlet. If fumigant tablets back up instead of reaching the treatment tunnel, the operator may not immediately know the system has stopped feeding while the product is already beginning to react.

Gopher General was designed specifically for fumigant delivery. Its air system keeps the product moving rather than depending on an open-bottom gravity drop that can plug against the soil.

There’s also a basic safety and label issue: fumigants should only be used with equipment and application methods allowed by the current product label. A machine designed for bait shouldn’t automatically be treated as fumigation equipment because both happen to operate underground.

Gopher General was designed from the beginning for slow-release fumigation with products such as Phostoxin and Weevilcide and can help reduce prolonged fumigant exposure when used correctly.

Choosing the right pocket gopher control method for your alfalfa field

Trapping, baiting and fumigation can all control pocket gophers. The best choice depends on more than field size.

Trapping

• Works well for isolated pocket gophers
• Requires finding individual active tunnels
• Adds more labor as activity persists or spreads

Baiting

• Can be done by hand or with a mechanical baiter
• Mechanical baiters reduce individual tunnel work
• Depends on the gopher finding and eating the bait

Traditional fumigation

• Treats the natural burrow system directly
• Does not depend on the gopher eating a treatment
• Requires locating and treating active tunnels individually

Gopher General fumigation

• Applies fumigant from the tractor
• Creates its own underground treatment tunnel
• Does not require locating individual natural burrows
• Does not depend on the gopher eating the treatment
• Reduces hand labor whether you’re treating a problem area or a larger field

The choice usually comes down to a few practical questions:

• How much active gopher pressure are you dealing with?
• How much hand labor do you want to put into control?
• Do you want to work individual natural tunnels or treat from the tractor?
• Are you comfortable relying on the gopher to take bait?
• What method fits the current soil conditions?
• How does treatment fit between irrigation and cutting?
• How much follow-up are you prepared to do when new activity appears?

For some farms, the answer will be more than one method. An isolated gopher may be worth trapping while a tractor-applied method handles another part of the field.

The goal is to choose a control approach that fits both the gopher pressure and the way you actually farm the alfalfa.

The best time to control pocket gophers in alfalfa

Pocket gophers don’t wait for a particular stage of the alfalfa crop to start feeding. They’re active year-round, and alfalfa gives them exactly what they want: a perennial food source with substantial roots and crowns underground.

So the best time to control pocket gophers isn’t based on when they start eating alfalfa. It’s when you can clearly find active gophers and the field conditions suit the control method you’re using.

In many growing regions, fresh mound activity becomes easier to see when soil moisture increases in the spring and fall. Irrigated alfalfa can support active gophers throughout the growing season, so growers also need to watch what happens between cuttings rather than waiting for one annual treatment window.

After a cutting is a particularly useful time to check the field. With the canopy down, fresh mounds and thin areas are easier to spot before regrowth starts hiding them again.

Timing pocket gopher trapping and baiting

Trapping and hand baiting can be used whenever you find active pocket gophers, but moist, workable soil generally makes finding and accessing tunnels easier.

In an alfalfa field, that means paying attention to fresh activity throughout the cutting cycle. If a few new mounds show up after a cutting, dealing with those gophers while the problem is still concentrated may save a much bigger job later.

Mechanical baiting also needs to fit around field access, irrigation and crop growth. The goal is to treat active ground without unnecessarily running equipment through alfalfa that’s ready to cut or fresh regrowth that doesn’t need another pass over it.

Timing pocket gopher fumigation

Fumigation adds another set of requirements because the soil has to help contain the gas underground.

For Gopher General, pay attention to:

• Fresh gopher activity so you’re treating ground where gophers are currently working
• Soil moisture that lets the machine form and seal a good treatment tunnel
• Soil temperature that meets the requirements of the fumigant being applied
• Field access that works with your irrigation and cutting schedule
• Crop stage so treatment doesn’t create unnecessary traffic through taller alfalfa or fresh regrowth

Irrigation can sometimes create a better treatment window when the field has been too dry to hold a good tunnel. The goal isn’t to follow a date on the calendar. It’s to line up active gophers, workable soil and a window when you can get across the alfalfa field without creating another problem.

Keep watching between alfalfa cuttings

A treatment window isn’t the same thing as a once-a-year gopher season.

Pocket gophers remain active, new animals can move into the field and irrigated alfalfa continues giving them a food source. Check for fresh dirt whenever you have a good view of the ground, especially after cutting and around areas where gophers have been active before.

Catching a handful of fresh mounds between cuttings gives you more options than waiting until the next time the whole field is showing activity.

Staying ahead of pocket gophers in an established alfalfa stand

Getting an existing population down doesn’t mean the field stays gopher-free.

Alfalfa remains in place for years, and new pocket gophers can move back into productive ground from surrounding areas. That makes follow-up especially important in a perennial crop.

After treatment, watch for:

• New mounds inside treated areas
• Fresh activity along field edges
• Thin areas where activity repeatedly returns
• Movement from neighboring ground
• Trouble spots that seem to come back between cuttings

The best time to deal with returning gophers is while the activity is still limited.

That may mean trapping one animal instead of treating a broader area. Or it may mean making another pass through a section where pressure is building again.

The goal isn’t to pretend you can make an alfalfa field permanently gopher-proof. It’s to keep the population low enough that the stand, hay quality and field operations aren’t continually paying the price.