What to do if wooden flooring is infested with borers?

What to do if wooden flooring is infested with borers?

If wooden flooring is infested with borers, don't panic. Follow these steps to eliminate them and prevent spread. Borer tunnels inside wood can be several centimeters deep, so surface spraying is insufficient; injection is needed to reach the nest.

Step 1: Determine the extent of damage

Carefully inspect all wooden flooring in the room and locate all holes. Use a vacuum (preferably with HEPA filter) to remove powder and debris around the holes — this removes some frass and larvae and facilitates subsequent injection.

Step 2: Chemical injection

Inject dinotefuran-containing household insecticide into the holes:

• For larger holes, aim the spray nozzle directly into the opening.
• For smaller holes, use a syringe (without needle) to inject the liquid.
• Treat every hole, allowing the liquid to flow into the tunnels.
• Larvae contacting the liquid will die.

Step 3: Seal the holes

After injection, seal the holes with wax, wood putty, or floor repair paste. This prevents new adults from emerging and prevents the insecticide from evaporating too quickly. Match the color to the flooring for an aesthetically pleasing repair.

Step 4: Treat surrounding flooring

Don't just focus on the holes; check the surrounding flooring:

• Tap the floor gently with a screwdriver; listen for hollow sounds.
• Check floor joints for powder.
• Treat any areas with signs of borer damage with injection.
• Severely damaged flooring (soft or deformed under pressure) needs replacement.

Step 5: Environmental control

After treatment and replacement, reduce indoor humidity below 50% — borers cannot survive in dry environments. Keep the floor ventilated and regularly check for new signs of damage.

How many treatments are needed?

Borer eggs and pupae are less sensitive to insecticides than larvae; one treatment may not kill all life stages. It is recommended to treat again after 2 weeks to ensure newly hatched larvae are also killed. Spring and autumn are the best times for treatment when borers are most active.