PestDex Details
Oriental Cockroach
Blatta orientalis
crawler
Dark, slow-moving roach found in damp basements and crawl spaces. Common in Mid-Atlantic rowhouses.
How to Identify
- •Shiny black or dark brown, 1 inch long
- •Shortened wings (can't fly)
- •Slow, lumbering movement
- •Strong musty odor
Where Found
Damp basements, crawl spaces, under mulch, storm drains. Prefers cool, wet areas. DC/Baltimore rowhomes with unfinished basements see frequent infestations.
Seasonality
Spring and fall when outdoor populations migrate indoors. Less active in winter cold.
Health & Property Risk
Contaminates surfaces with bacteria from drains and decaying matter. Odor becomes overwhelming in heavy infestations.
Prevention Tips
- •Fix basement leaks and improve drainage
- •Remove leaf litter and mulch from foundation
- •Seal cracks in foundation walls
- •Install vapor barrier in crawl space
- •Keep gutters clean to prevent moisture
Treatment Notes
Granular bait in crawl spaces and perimeter. Spray treatment in voids. Address moisture — they won't survive in dry conditions.