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Signs of Cockroaches: Droppings, Egg Cases, and Smells
Roaches hide by day. That means signs can show up before the bugs do. Here is what to look for.
What do cockroach droppings look like?
The UNC Center for Environmental Health says cockroach droppings look like ground coffee or black pepper. Mouse droppings are different. They look like dark grains of rice.
What do egg cases look like?
Penn State Extension says German cockroach egg cases are light brown, purse-shaped, and less than 1/4 inch long. Each holds up to 48 eggs. The female carries the case until it is nearly time to hatch, so you may see one sticking out of her body.
What other signs are there?
A musty, oily smell when there are a lot of roaches
Roaches in the open during the daytime, which can mean a large group
Shed skins and tiny young roaches (nymphs)
Sticky monitors that catch roaches overnight
UF/IFAS Extension says you can use your nose as well as your eyes, and says daytime sightings suggest a large population.
Where should you look?
Behind and under the fridge, stove, and dishwasher
Under sinks and around pipes
Inside cabinet corners and hinges
Behind appliances and in storage boxes
Near drains and in bathrooms
Use a flashlight. Then read Seeing Baby Roaches? or German vs American Roaches.
Quick Answers
What do roach droppings look like?
Like ground coffee or black pepper, says the UNC Center for Environmental Health.
Does seeing one roach mean an infestation?
Not always. One adult may be a new arrival. UF/IFAS says all life stages together point to an established problem.
What does an egg case look like?
A light brown, purse-shaped case less than 1/4 inch long, according to Penn State Extension.
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