What to do if there are suddenly too many flies in the house?

What to do if there are suddenly too many flies in the house?

If a large number of flies suddenly appear indoors, do not rush to swat them — finding the breeding source is the key.

Step 1: Locate the breeding source

Flies do not appear out of nowhere; there must be a suitable breeding site nearby. Check the following key locations:

1. Garbage bins — is kitchen waste sealed? Is there liquid leaking from the bottom?
2. Drains — does the kitchen sink or bathroom drain have odors? Are pipes blocked?
3. Pet waste — is the litter box or dog toilet cleaned promptly?
4. Dead animals — check ceilings, storage rooms, and cabinet corners for decaying carcasses?
5. Outdoor sources — are there garbage piles or rotting plants near doors or windows?

Step 2: Clean and kill

After locating the source, clean it thoroughly. Then apply dinotefuran-containing household insecticide to surfaces where flies like to rest:

• Window frames and screens — flies rest here while waiting to enter.
• Light fixtures and ceilings — flies gather around lights in the evening.
• Corners and high walls — flies prefer to rest on walls above 1.5 meters from the floor.
• Garbage bin lids and surrounds — reduce fly activity near bins.

After spraying, the dried insecticide forms an invisible film. Flies that land on it die within hours; residual effect lasts about 2-4 weeks.

Step 3: Physical barriers

Repair torn screens; install weather stripping on door frames. Install transparent door curtains or air curtains at entrances for added effectiveness.