PestDecoderDecode a clue

Inspection route

Kitchen pest clues

Food, water, heat and narrow appliance voids make the kitchen a high-signal inspection area.

Inspect in this order

Start where evidence is most likely to remain undisturbed. Photograph scale and placement before cleaning, then establish a clean baseline only when the material can be handled safely.

  1. Inspect behind and below the refrigerator and range without moving live utilities.
  2. Check cabinet hinges, drawer corners and pipe penetrations with a flashlight.
  3. Photograph any sign with scale before cleaning.
  4. Compare fresh signs after establishing a clean baseline.
Avoid this shortcut

Do not spray unidentified residues near food-preparation surfaces.

Common candidates in this location

Location helps prioritize candidates, but it does not identify a pest by itself. Use a physical sign and companion clue before making a treatment decision.

high concern

German cockroach

Blattella germanica

Pepper-like spotting, small ridged egg cases and nighttime activity clustered near food, water and heat.

DroppingsEggs and casesShed skins
Read evidence profile
high concern

House mouse

Mus musculus

Small smooth tapered droppings along edges, fine gnawing and shredded nesting material near food routes.

DroppingsHoles and openingsSounds and movement
Read evidence profile
medium concern

American cockroach

Periplaneta americana

Large droppings or dark capsules near drains and humid utility routes, often with a large fast adult sighting.

DroppingsEggs and casesShed skins
Read evidence profile
low concern

Fruit fly

Drosophilidae

Compact tan flies hovering actively around fermenting fruit, beverage residue or recycling.

Larvae and grubsEggs and casesOdors
Read evidence profile
medium concern

Phorid fly

Phoridae

Hump-backed side profile, erratic running and repeated emergence near hidden moist decay or plumbing defects.

Larvae and grubsOdorsEggs and cases
Read evidence profile
low concern

Drugstore beetle

Stegobium paniceum

Hump-backed brown adults, small package pinholes and fine product dust without obvious silk.

Holes and openingsLarvae and grubsDamage and gnawing
Read evidence profile

Evidence types worth checking

Droppings

Shape, ends, texture and placement can narrow rodents, cockroaches and bats without touching the material.

7 candidate profiles

Inspect this clue

Eggs and cases

Capsules, clusters and attached cases can separate cockroaches, moths, bed bugs and flies when scale and placement are documented.

8 candidate profiles

Inspect this clue

Shed skins

Cast skins preserve body shape and are often more diagnostic than a fleeting live sighting.

6 candidate profiles

Inspect this clue

Stains and smears

Fecal spotting, rub marks and blood-like stains gain meaning from placement, solubility and nearby physical evidence.

5 candidate profiles

Inspect this clue

Odors

Musty, oily, ammonia-like or sewage-associated odors are supporting clues only and should be tied to a physical source.

8 candidate profiles

Inspect this clue

Holes and openings

Diameter, edge quality, material and debris below an opening can distinguish insect exit holes, rodent routes and wildlife entry.

8 candidate profiles

Inspect this clue

Build a repeatable baseline

Record the date, exact position and a scale reference. If cleanup is safe, note whether the sign returns in the same route, below the same opening or near the same resource. Repeat location can be more informative than color or a single photograph.

Source basis