Why Millipedes Come Inside
Millipedes are a common pest in most parts of the country. They are attracted to cool moist areas around houses, so they are frequently found in large numbers under mulch, pine straw, and leaves. They may crawl indoors in stress periods of hot, dry weather, seeking a moist and a more favorable environment. At times they can move indoors in large numbers and create a major nuisance. They don’t bite or carry disease but when populations are high they can be difficult to eliminate.
Indoor applications of insecticide may cause the millipedes to die a little quicker but won’t stop them from coming in. Treating the exterior perimeter of the home along with sealing entry points is the best approach to keep them out. Also spray around foundation vents, utility openings, underneath sidings and around crawl space doors and along entryways. In addition spray a 3 to 6 foot wide area of ground along the foundation in mulched, ornamental plant beds and grassy areas. Getting the chemical into the ground is the goal. Since mulch may absorb and tie up a good portion of the insecticide, it is recommended to rake the mulch back before applying the insecticide. A hose-end sprayer may be the best choice for putting out the large volume of liquid insecticide needed to penetrate the ground.
Another effective treatment method is to apply a granular insecticide around the structure and water it in heavily.
As with all pesticides, follow the directions on the product label