Some will be eliminated by breaking up and raking away mulch and leaf litter to expose the soil surface to air and sunlight. It may be necessary to apply insecticides for satisfactory control. You'll get best results if the surface of the ground is cleared of debris and the insecticide is applied to the soil. If this is impractical, apply insecticide to the surface of the mulch, then work or wash it in. The insecticide must filter down through the mulch to reach the millipedes.
Millipedes dry out and die quickly inside the house, except in damp basements.
Insecticides are of little value in the house after the pests have gained entrance. To prevent entry, spray on foundations, steps, and frames of doors and windows, where millipedes get in. If you have extensive millipede populations inside, correct the moisture problem to reduce infestations. Measures to control millipedes are also useful against sowbugs or pillbugs. John C. Nye, Dean and Director.