What's That Bug? does not endorse extermination

Subject:  Hundreds of caterpillars
Geographic location of the bug:  Hershey, pa
Date: 05/04/2019
Time: 09:38 PM EDT
Your letter to the bugman:  hi, I went out to my garden this evening around 9:30 and found these bugs walking all over my raised beds and up the walls of my house. I didn’t see any on my plants. they are small, very skinny about three-quarter inch to an inch long.What are they?
How you want your letter signed:  Skaterma

Millipede Invasion

Dear Skaterma,
These are not Caterpillars.  They are Millipedes.  Here is an Iowa State University article on Millipedes where it states:  “Millipedes are harmless. They can not bite or sting and they do not feed on structures, furnishings or landscape plants. They do feed on damp and decaying plant material and are ecologically beneficial as “recyclers” of organic matter. They live outdoors in damp areas such as under leaves, needles, plant debris, mulch and similar habitats.

The bad news is millipedes often embark on mass migrations, especially on humid, warm nights in the fall and spring, during which time they wander into garages, basements and other parts of the house. All millipedes found inside have strayed in by mistake from breeding sites in the vicinity. Millipedes can not reproduce indoors.
Millipedes are most active at night. They wander out from their damp hiding places and roam aimlessly, often covering large distances with their slow, steady crawl. They are not drawn to garages and houses nor are they searching for anything in particular (food, warmth, mates, etc.).
Wandering millipedes eventually bump into the house where they find small gaps or cracks. They crawl into these small openings as a shelter from the dryness of the coming daytime. Millipedes hide during the day under the bottom edge of the garage door, in cracks along the house, sidewalk or driveway and in gaps in the foundation. Openings in the foundation allow the millipedes to enter the house, where they continue wandering until they find a place to hide or until they expire from lack of moisture, coiled in the corners of a room.”

What's That Bug? does not endorse extermination
Location: Hersey, Pennsylvania

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