A season-by-season guide to pest activity in the Midlands

Pest activity in the Midlands follows the seasons closely enough that most calls are predictable once you know the pattern. Here is what tends to show up, and roughly when.

Late winter into spring

Queen wasps emerge from hibernation looking for a nest site, which is why a solitary large wasp in February or March is a queen scouting rather than the start of an infestation. Cluster flies that overwintered in a roof void become active again as the loft warms slightly on sunny days. Rodent activity indoors, which built up through winter, is often still ongoing from the previous autumn.

Late spring and early summer

Ant activity increases as the ground warms, and flying ant days — a single afternoon of mass swarming as new queens leave established colonies — become more frequent from June onward. Bee swarms, a temporary cluster of a relocating honeybee colony, peak in May and June. Wasp nests founded in spring are now growing quickly.

High summer

Wasp activity is at its most visible from late July through September, as colonies reach their largest size and workers become more defensive. Fly activity increases generally, and bedbug reports rise, which tracks with increased travel and more overnight guests rather than anything seasonal about the insect itself.

Autumn

This is when rodent call-outs climb sharply. As the temperature drops and ground cover dies back, rats and mice move from open ground toward buildings that offer food and shelter — the same pattern every year, and the reason September to January is our busiest period for rodent work. Wasp nests decline and can become more aggressive as they die off. Cluster flies begin seeking out roof voids to overwinter in.

Winter

Rodent activity indoors continues, since a building that already has an entry point stays attractive through the cold months. Most insect activity is dormant. It is a good time to have proofing work done, since it addresses the problem before the next autumn's pressure builds.

None of this is a substitute for looking at what is actually happening at your property — a mild autumn or a building right next to open farmland will not track the calendar exactly. If something does not fit the pattern, that is usually worth a call in its own right.