Kitchen activity after the summer

What the change in weather does

Through the peak of summer a kitchen is one of the least attractive places in an apartment for a cockroach: the extraction runs, the surfaces are dry, and everything alive is pressed into the damp cavities behind and beneath the units. As the outside temperature drops and windows and balcony doors start being left open, that pressure eases. Insects that spent the summer in a wall void or a riser move out along the same routes they came in by, and those routes end at water.

Ants arrive for the same reason and behave differently. Trails that ran outdoors in the evening heat begin running indoors, and a trail is a committed thing: once established along a skirting or a worktop seam it persists until the trail itself is broken, not until the visible ants are killed.

Schools going back matters more than it sounds. Kitchens that were quiet in August are producing three meals a day again, and the crumb and grease load under appliances rises in the same week the weather turns.

What to check, in order

Under the sink first. The trap, the shut-off valves and the point where the waste pipe enters the wall are where condensation and small leaks collect, and it is where almost every kitchen infestation we attend in these two emirates begins. Run a dry tissue around the pipe collar; if it comes away damp, that is the harbourage.

Then behind and beneath the fridge. The condenser is warm, the drip tray holds water, and the gap behind it is rarely cleaned. Pull it out if you can do so safely and look at the floor and the wall junction rather than the appliance.

Then the cupboard hinges and the underside of the worktop overhang. Cockroaches rest on the underside of surfaces, so a torch pointed upward into a cupboard corner tells you more than the same torch pointed down.

Finally the balcony threshold and the window frame. An ant trail almost always crosses at one fixed point, visible as a faint line of traffic rather than a crowd.

What helps before anyone attends

Fix the water. A dripping trap or a sweating pipe will defeat any treatment, because it restores the conditions faster than a product can remove the population. Dry the cavity and keep it dry, and activity often falls on its own.

Do not spray a visible ant trail with an off-the-shelf aerosol. Killing the ants on the trail removes the workers you can see and splits the colony's foraging into new routes, which is why a single trail becomes three a week later. Wipe the trail with detergent to break the chemical marking instead, and leave the rest.

Bag food waste and take it out in the evening. Most of what feeds an autumn kitchen population is not stored food; it is what sits in the bin overnight.

When to call

Call when you see activity in daylight, when you find droppings or shed skins in a cupboard rather than insects on the floor, or when a trail re-forms within a few days of being cleaned. Each of those says the population is established behind the units rather than passing through.

Tell us what you saw, where exactly, since when, and whether there are children or pets in the property. A treatment aimed at a harbourage under a sink is a different visit from one aimed at a trail crossing a threshold, and we would rather send the right one first.