Sydney gets moth surges when adult bogong moths migrate in spring, when wind and city lights pull them off course, and when pantry or clothes moths are already breeding indoors. The first kind is a short seasonal visit. The second kind means eggs and caterpillars are living in your food cupboard or wardrobe. Knowing which one you have changes what you should do next.
Spring migration, not a new home
Bogong moths (*Agrotis infusa*) are native to Australia. The Australian Museum says they are well known in south-eastern Australia for mass migration in spring. In some years they reach cities such as Sydney and Canberra in large numbers. Adults fly from inland breeding areas toward high country in the southern Dividing Range, where they rest through summer in rock crevices. Later they move north again to breed, because their larvae cannot cope with cold.
CSIRO describes bogong moths as brown to blackish, with a wingspan of about 45 millimetres. Adults travel long distances to spend summer in caves and crevices of the Australian Alps. In winter they disperse to pastures across inland New South Wales and Queensland to lay eggs. Many are drawn to lights at night, and large numbers can enter houses.
So a spring wave of large brown moths on walls, windows and outdoor lights is often migration, not a nest that started in your kitchen.
Why lights and wind push them into Sydney homes
The Museum notes that bogongs are sometimes blown toward the coast by westerly winds and may enter houses because they are attracted to light. Northern Beaches Council reported the same pattern in October 2026: spring migration across Sydney and coastal NSW, with moths pushed off course by northerly winds and warmer conditions, then drawn to homes and outdoor lights.
Council advice for migratory bogongs is simple. Turn off indoor lights and leave one outdoor light to guide them out. Or trap a moth gently under a glass and a piece of card and move it outside. Turn off extra outdoor lights. Do not spray insecticide at these migrating adults. They are not trying to settle in your cupboards. They are trying to finish a long flight.
Condell Park sits close to Bankstown Airport, where bright night lighting is common. If large brown moths keep clustering on a Condell Park verandah light during a spring surge, book moth control in Condell Park only after you have checked whether the moths are also breeding in food or fabric indoors.
Bogongs are not pantry moths or clothes moths
Size and place matter. Bogong adults are relatively large (about 45 mm wingspan). Pantry moths and clothes moths are much smaller and are tied to a food source or fabric source inside the home.
A pantry moth infestation shows up as webbing in flour, rice, cereal, nuts or pet food, clumps of food stuck together, and moths resting on kitchen ceilings by day. Clothes moth problems show up as holes in wool, silk or fur, and damage deep in dark wardrobes or drawers. The adult moths you see in those rooms are usually the tip of an indoor breeding cycle. Their caterpillars do the eating.
Bogongs do not breed in your pantry or your jumpers. Their larvae feed inland as cutworms on seedlings. Adults that land on a Sydney wall are visitors on a migration route.
Revesby backs onto bush and the Georges River corridor. If Revesby houses keep finding small moths and webbing inside rice or flour packets after a spring swarm has already moved on, arrange quick moth control in Revesby so the breeding spot in the cupboard can be found.
When a surge is outdoor migration only
Ask three questions:
- Are the moths large, brown to blackish, and arriving all at once around outdoor lights?
- Do they vanish after a few days or weeks once the weather and wind change?
- Is there no webbing in dry food and no holes in wool clothes?
If the answers are yes, you are likely seeing a migration pulse. Follow the Northern Beaches Council steps: reduce lights, move moths outside gently, and leave sprays alone for those adults.
Punchbowl has dense housing and bright street lighting along the rail corridor, so spring moths gather on windows there every year. If small moths are still showing up in a Punchbowl kitchen or wardrobe after that wave has passed, book urgent moth control in Punchbowl before the larvae spread to more food or fabric.
When moths mean an indoor problem
Call for treatment when moths keep appearing in the same room for weeks, when you find webbing or frass in dry food, when wool items keep getting holes, or when small moths keep hatching after you have cleaned one shelf. That pattern points to eggs, larvae and adults living on site.
Greenacre sits between large parks and busy shopping strips. If Greenacre kitchens keep getting pantry moths long after any outdoor surge has ended, book fast moth control in Greenacre so the larvae in packets and corners are treated, not only the adults on the ceiling.
Do not wait for a second wave of damaged food or ruined wool. One missed stage (egg, larva, pupa or adult) can restart the cycle.
What to tell the technician
Photograph one moth next to a ruler. Note the date, whether outdoor lights were on, and whether you found webbing in food or holes in fabric. That short record separates a spring bogong pulse from an indoor breeding job. Then contact Bankstown pest control service with the photo, so the visit targets the right source instead of spraying every moth that flies past a window.