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It is possible to construct a fence that will deter badger entry. Badgers are strong and persistent animals that can easily break through or dig under a weak or poorly constructed fence. They can climb well, and will squeeze through quite small gaps.A strong wooden fence with heavy wire mesh attached and extended below ground, or a heavy wire mesh fence with the bottom extended below ground is recommended. Chicken wire is inadequate. The extension below ground will need to extend at least 600mm depending on the soil structure and have a horizontal return away from the garden of at least 300mm. The fence will need to be at least 1200mm high, and with wire mesh fencing an overhang of at least 300mm is recommended directed away from the garden.An alternative barrier is a stone, brick or block wall with a suitable foundation dependant on soil structure. Such a wall should be at least 1200mm high with a smooth surface finish to deter climbing.Electric fencing, energised either by battery or transformed mains electric supply, can be an effective deterrent. It can also be installed either temporarily or permanently, and can be used to protect the whole or a specific part of a garden.
Badgers will not climb a fence. There is either a hole in your fence, they have dug under it, it's not secured at the ends or something else has taken your corn, most likely a fox (or fox family). Badgers do not leave the ground! Last thought if the mesh is the stuff used to pen sheep ie about 4 inches, a young badger will get through the mesh.