Cockroaches are one of the most common household pests in Barcelona and Girona, and they breed at an alarming rate: a single German cockroach can produce more than 300,000 offspring in a year. If you suspect you have them at home, acting fast is what keeps a small problem from turning into a full-blown infestation.
Clear signs you have cockroaches at home
Cockroaches are nocturnal, so spotting one in daylight usually means the infestation is already well established. Here are the signs worth watching for:
- Droppings: small black or brown specks, much like ground pepper, that turn up in kitchen drawers, behind appliances, under the sink or in the corners of cupboards.
- Oothecae (egg capsules): elongated dark brown capsules, around 8 mm long, each holding between 30 and 50 eggs. You will find them stuck in dark corners, behind furniture or tucked inside cracks.
- Unpleasant smell: cockroaches give off pheromones with a distinctive musky, stale odour. A strange smell in the kitchen or bathroom can be an early warning.
- Shed skins: as they grow, cockroaches moult several times. Coming across translucent exoskeletons is a clear sign they are active.
- Dark marks on walls: brown or black smears where the walls meet the floor, especially in damp spots.
- Night-time sightings: if you turn on the kitchen or bathroom light at night and see cockroaches scurrying for cover, the infestation is already well advanced.
The most common cockroach species in Barcelona and Girona
Three species turn up most often across the Mediterranean side of Catalonia:
- German cockroach (Blattella germanica): about 1.5 cm long, light brown with two dark stripes across the thorax. It is the one you tend to find in kitchens and bathrooms, it breeds at a staggering rate, and it is the hardest of the three to get rid of.
- American cockroach (Periplaneta americana): the biggest of the lot at 3 to 4 cm, reddish brown. It lives in sewers, basements and garages, and in summer it climbs up drains and pipes into flats and business premises.
- Oriental cockroach (Blatta orientalis): around 2.5 cm, glossy black. It favours very damp spots such as basements, inspection chambers and meter cupboards. Slower than the others, but every bit as tough.
The health risks of a cockroach infestation
Cockroaches are not just unpleasant, they are a genuine health hazard. They travel through sewers, rubbish and rotting matter, then wander across your worktops, your food and your kitchen utensils:
- Disease transmission: they can carry Salmonella, E. coli, Staphylococcus and other pathogens responsible for gastroenteritis, diarrhoea and food poisoning.
- Allergies and asthma: their droppings, shed skins and body remains are loaded with allergens that can set off asthma attacks, dermatitis and allergic rhinitis, particularly in children.
- Food contamination: a cockroach that crosses your food can leave behind bacteria, parasite eggs and residues that affect both its taste and its safety.
Why do cockroaches appear in the home?
Knowing what draws them in is half the battle when it comes to keeping them out:
- Damp: cockroaches need water. Leaking pipes, dripping taps and condensation in bathrooms and kitchens act like a magnet.
- Food remains: crumbs, built-up grease, uncovered bins, unwashed dishes and pet bowls all keep them well fed.
- Cracks and crevices: they slip in through gaps around doors and windows, ventilation ducts, pipe openings and cracks in the walls.
- Sewers: the American cockroach works its way into buildings up the pipework, especially on lower floors and during hot summer nights.
What to do if you find cockroaches
Home remedies like boric acid, vinegar or sticky traps might help as a stopgap, but they rarely clear an established infestation. Cockroaches breed faster than any DIY method can catch them.
The approach that actually works is a professional pest control treatment that brings together:
- Full inspection: pinpointing the sources, the entry points and the scale of the infestation.
- Insecticidal gel treatment: applied at strategic points. The cockroaches feed on the gel, return to the nest and pass it on to the rest of the colony, the so-called cascade effect.
- Sealing of entry points: closing off the cracks, crevices and gaps they use to get in.
- Follow-up: a return visit after 2 to 3 weeks to confirm the colony is gone and top up the treatment if needed.
Professional treatment in Barcelona and Girona
At ERRADICAT we specialise in the control and elimination of cockroaches in homes, residential communities and businesses right across Barcelona and Girona. We work with biocides authorised by the Spanish Ministry of Health, applied by technicians who hold the official applicator licence and placed at specific, inaccessible points. The protocol is 3 visits over one month, with a 1-year written guarantee on the service. Request your free quote and we will get back to you within 24 hours.