Correct identification is vital to mole damage control. There are two
species of moles in the Midwest and both have large, shovel-like front feet
with long claws.
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Eastern Mole - The eastern mole has
a naked red nose and a short tail. It makes many shallow tunnels that raise
the soil into long, winding 2 inch high ridges. The few mounds that it
makes are low, rounded and often have bits of turf on them. It prefers
well drained soils. |
Starnose Mole - The starnose mole has
a large red nose with 22 finger like projections and it has a long tail.
This species digs deep tunnels that are not visible from the surface. They
produce many conical mounds of soil 6 inches high and 12 inches wide. Starnose
moles prefer moist soils. |
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Moles frequently cause damage but are also beneficial since they feed
on insects, worms and other invertebrates. They help aerate the soil by
burrowing. Occasionally, they eat plant seeds, roots and
bulbs but most
damage is done when burrows expose plant roots to the air inside the tunnels.
They are most active in spring or fall and on cloudy days. During winter
and midsummer, they burrow deeper into the ground. Moles have very extensive
underground systems including travel tunnels which are used daily and foraging
tunnels which are rarely re-used.
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The following methods are the most effective
for the control of mole damage in lawns. |
I. Direct Killing
For Eastern moles, flatten the tunnels and then identify
those that are repaired the next day. Flatten them again and check them
periodically through the day to see when the moles are active. This is
often late morning or early evening.
When a mole is observed pushing through the
tunnel, it may be killed with a shovel or similar instrument. Diligence
and patience are required for success. This method rarely works on the
starnose mole which burrows too deeply into the soil to be seen.
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II. Trapping Moles
Eastern Moles - Trapping is the most
effective method of mole control. Carefully place traps in active tunnels
(i.e. those that were repaired 12 to 24 hours after being flattened).
Work the harpoons or jaws of the trap gently through the soil to insure
smooth penetration.
If traps are sprung prematurely, remove a small piece of sod from under the
trigger pan to delay the action of the trap. If moles burrow around a trap, the
soil has been flattened too tightly or part of the trap is projecting into the
tunnel and is alarming the mole.
Be sure no light can penetrate into the tunnel near the trap.
Starnose Moles - To trap starnose moles,
locate an active tunnel by flattening the mounts of soil. Mounds that are
pushed back up in 24 to 48 hours are over active tunnels. Beneath one of
the mounds, dig a hole 4 to 6 inches deep to the bottom of the tunnel.
Refill the hole with enough soil to cover the tunnel and then set the harpoon
trap in the hole.
If the trap is set in an active tunnel, it should catch
a mole within 24 to 48 hours. If not, reset the trap and check for
problems such as light getting into the tunnel or the trigger mechanism
need adjustment.
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Plunger Trap |
Scissor Trap |
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Snare Trap |
Scissor trap set over mole tunnel |
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Tube Trap |
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III. Repellants
There are several repellants available that seem to work
quite well on the Eastern mole. These products are castor oil based. When
they are spread on the ground and watered in, they are an irritant to the
mole. This causes them to stay out of the treated area from one to three
months. One product, Mole-Med, gave excellent results on 25 of 26 lawns
during a recent study at Michigan State University.
Treating bulbs with the repellent thiram prior to planting may repel
moles for several weeks. It soon washes off as rainwater moves through
the soil around the bulbs.
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IV. Reducing Mole Food Sources
Moles are insectivores. They feed insect larvae such as grubs but a large
part of their diet consists of earthworms. The use of
insecticides to reduce
the food supply especially in light or sandy soils may help reduce but
will not eliminate mole populations. It tends to have little effect
on heavy,
clay type soils.
Insecticides such should not be used unless
high levels of insects such as
European chafer grubs are causing lawn problems.
Routine use of insecticides on lawns for "prevention" purposes should be
avoided. Studies indicate that this kills off predator insects that keep
certain lawn pests under control naturally.
Any insecticide treatment will have limited effect if only one section
of the mole's burrow is treated such as a single yard in a neighborhood.
Moles will continue to burrow through treated areas in search of food.
Also, moles will eventually move back into the area from adjacent open
fields or wooded areas.
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Smoke Fumigation
- Smoke fumigation using specially designed cartridges for mole control
is difficult. The key problem is treating a wide enough area with enough
cartridges to be effective. All parts of the tunnel must be treated simultaneously.
Many mole tunnel systems are so extensive that this is not practical.
Vibrating Devices - Devices such
as electrical vibrators or plastic windmills which send slight tremors
through the ground will repel moles. Unfortunately, each device has a very
limited range of effectiveness so the average yard
would require dozens of them to be effective.
In the case of electronic devices, this gets expensive. Hundreds of yellow
whirling plastic flowers in the yard would be unsightly.
Cats - Cats may kill the occasional
star nosed mole but more often, they catch small, grey animals called shrews.
These animals are actually predators of young moles so killing them may
actually add to the mole problem. Also, cats seem to choose to be mole
catchers or not. Nobody knows how to train them to go after this pest.
Poison Baits - Baits registered for
mole control such as pellets treated with arsenic and zinc phosphide are
either ineffective or unreliable. Fresh baits tend to work better than
those that have been setting on the shelf for long periods.
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Home Remedies - Mothballs, spreading
lime on the soil, chewing gum, broken glass, exhaust fumes and flooding
the tunnels are not effective in controlling moles. People have tried all
manner of techniques over the years but, in controlled
studies, only trapping, direct killing and castor oil based repellants
worked.
If anyone comes up with a quick, easy, inexpensive way of ridding the
home lawn of moles, please let me know. We will share the riches.
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