What makes some Orange County houses millipede magnets
The houses that get hammered share three things: organic material piled against the foundation, soil that stays wet, and an easy way in. Orange County has plenty of all three.
Newer subdivisions in Monroe, Chester and the Town of Wallkill are landscaped with thick mulch beds right up to the siding, often on top of heavy clay fill that drains slowly. The millipedes breed in that mulch all summer. When they move in fall, the sill plate of a slab-on-grade house or the gap under the garage door is inches away. You will see the same thing across Goshen, Chester and Blooming Grove.
Older homes have their own problems. Fieldstone and block foundations in villages like Walden and Goshen have mortar joints that have crumbled enough to let small arthropods through, and basements that are damp most of the year. Houses along the Wallkill River, the Moodna and the low ground in the Black Dirt region see high water tables that keep the soil soaked well into fall.
Wooded lots add another layer. Homes backing onto forest around Tuxedo and the Upper Delaware collect deep leaf litter every year, and leaves left along the foundation over winter turn into prime millipede habitat by summer.