Why cockroaches and redbacks surge in Melbourne from November to February, where to check around your home, redback bite first aid, and when to book.
Need help with this pest problem? Request a free onsite quote from Pest Eraze or call 0416 528 547. Tell us your suburb and the signs you have noticed.
Every Melbourne summer brings the same two calls: cockroaches turning up in the kitchen, and redback spiders found under the outdoor furniture. Warm nights speed up both pests' breeding, and holiday routines (more outdoor eating, bins that sit longer, sheds and toys pulled out) put people in contact with them more often. Here is what changes between November and February, where to look, and when to get help.
Why summer is peak season
Cockroaches breed faster in the heat
Cockroaches are cold-blooded, so warmer conditions speed up their development. German cockroaches, the small light-brown species found in kitchens and apartments, can go from egg to breeding adult in a matter of weeks in a warm kitchen, and a single female carries dozens of eggs at a time. A few sightings in October can become an established problem by January if nothing changes.
American cockroaches, the large reddish-brown ones, live mostly outdoors in drains, sub-floors and garden beds. Hot, humid nights bring them inside through floor wastes, gaps under doors and wall vents. If you are not sure which one you have, our guide to German vs American cockroaches explains why the difference changes the treatment.
Redbacks are most active in warm months
Redback spiders (Latrodectus hasselti) are found right across Melbourne. They build untidy, tangled webs in dry, sheltered spots close to the ground, and the females, with the distinctive red or orange stripe, are the ones that bite. In summer they are more active and egg sacs hatch, so you tend to see more webs, and people are more often outside reaching into the places they shelter.
Where to check around a Melbourne home
For cockroaches (indoors)
- Behind and under the fridge, dishwasher and oven, where the motors keep things warm
- Inside the hinges and corners of kitchen cupboards and pantries
- Around the sink and under-sink plumbing
- Bathrooms and laundries, especially floor wastes
- Droppings that look like ground pepper, a musty smell, or shed skins are all signs of an established population
For redbacks (outdoors)
- Under outdoor tables, chairs and play equipment
- Inside letterboxes, meter boxes and under bins
- Pot plants, garden edging, stacked bricks and timber
- Sheds, garages, gumboots and gloves left outside
- Children's sandpits and outdoor toys that have been stored for winter
Wear gloves when moving stored items, and shake out shoes and gardening gloves before putting them on.
Redback bites: first aid
Redback bites are painful and can cause sweating, nausea and spreading pain, though serious illness is uncommon. Australian first-aid guidance for a redback bite is:
- Wash the area and apply an ice pack or cold compress to relieve the pain.
- Do not use a pressure bandage (unlike snake or funnel-web bites).
- Seek medical advice if pain is severe or keeps getting worse, or if the person is a child, elderly or unwell.
- For advice, call the Poisons Information Centre on 13 11 26. In an emergency, call 000.
What you can do now
- Cut off food and water: wipe benches at night, keep food sealed, fix dripping taps and empty pet bowls overnight.
- Reduce clutter: cardboard boxes and paper bags give cockroaches shelter; stacked items outdoors give redbacks shelter.
- Seal entry points: gaps around pipes, under doors and around floor wastes.
- Be careful with supermarket sprays: spraying a German cockroach problem often scatters it into new hiding spots without reaching the nest. Gel baits work differently and should not be sprayed over.
Our guide on how to get rid of cockroaches in Melbourne goes into more detail.
When to book a treatment
Book an inspection if you see cockroaches in daylight (a sign there are too many to stay hidden), if sightings continue for more than a week or two, or if you have young children playing in areas where you keep finding redback webs.
A professional treatment usually combines targeted baits and residual products placed where the pests actually live, rather than a general spray. For cockroaches, a follow-up visit is often part of the plan for an established German cockroach population. For spiders, the treatment focuses on eaves, fences, outdoor furniture and garden areas.
Pest Eraze treats cockroaches and spiders across Melbourne from our base in Greenvale, and a general pest treatment covers both. Before your visit, read our preparation checklist.
Call 0416 528 547 or request a free onsite quote. There is no call-out fee.
