Seeing cockroaches pass by just one individual should not make you complacent, as cockroaches are nocturnal and prefer dark, damp places with food and water. Spraying the visible cockroach only addresses the symptom, not the root cause. To effectively solve cockroach problems, you must also adjust your home's environment. Thairath Online recommends six methods to eliminate entire cockroach nests as follows.
1. Use cockroach bait
Solve the problem of cockroaches hiding in dark corners by applying bait gel or bait stations along their paths, such as under the kitchen sink, beside trash bins, behind the refrigerator, or where cockroach droppings are found.
2. Use glue traps where cockroaches travel
Glue traps may not immediately eliminate all cockroaches but help identify hotspots of heavy infestation. Place traps in hidden corners like under sinks, under cabinets, behind appliances, or along walls. When many cockroaches are caught in a spot, increase bait placement and intensify cleaning there.
3. Clean the kitchen and store food securely
Even tiny food scraps—rice grains, crumbs, sugary residue, oil stains, or pet food left out—easily attract cockroaches indoors. Clean tables, stoves, and floors immediately after cooking, wash dishes promptly without leaving them overnight, and store food in tightly sealed containers. Trash bins should have secure lids and food waste should be disposed of regularly to reduce cockroach access.
4. Eliminate water sources and moisture
Cockroaches prefer damp areas like under sinks, bathrooms, or refrigerator drip pans, making these prime hiding spots. To prevent them from settling, regularly check and repair leaks in pipes and faucets, wipe surfaces dry, and avoid letting water accumulate.
5. Seal cracks and entry points where cockroaches hide
Inspect cracks in walls, gaps around pipes, door and window edges, cabinet joints, and around appliances. Seal accessible cracks with appropriate materials to reduce hiding places and block cockroaches from entering from outside or adjacent areas.
6. Inspect cockroach egg sacs and hiding spots
If you find cockroach egg sacs or suspect their presence, do not leave them unattended. Collect them in sealed bags or containers before disposing of them and clean the surrounding area thoroughly. Pay special attention to behind refrigerators, under stoves, inside kitchen cabinets, cardboard boxes, piles of rarely moved items, and near food or moisture sources.
Spraying insecticide against cockroaches Spraying kills only visible cockroaches and cannot reach those hidden in corners. Therefore, all six methods should be combined: baiting, trapping, removing food scraps and water sources, inspecting crevices, and sealing entry points. This gradual approach reduces cockroach numbers and breaks their breeding cycle permanently. If cockroaches persist despite these efforts, consult a specialist to assess and select the most appropriate control method.