How to use dinotefuran-containing household insecticide spray against house longhorn beetles?

How to use dinotefuran-containing household insecticide spray against house longhorn beetles? Using dinotefuran spray against house longhorn beetles requires precise injection, as the larvae are deep inside the wood (tunnels can reach 10-20 cm deep); surface spraying is largely ineffective.

Step 1: Locate fresh holes

Not all holes need treatment; look for ones with fresh activity:

• Fresh holes have clean edges, with new wood shavings around them.
• After cleaning the shavings from the hole, fresh wood texture is visible.
• Old holes (no longer inhabited) have darkened edges and no shavings.

Step 2: Clear the tunnel

Use a thin wire or screwdriver to gently clean wood shavings and frass from the hole, clearing the tunnel for liquid penetration. Use a vacuum to remove the debris.

Step 3: Inject insecticide

Spray dinotefuran-containing household insecticide directly into the holes repeatedly to allow the liquid to penetrate deep into the tunnels:

• Spray each hole for 5-10 seconds to allow sufficient liquid flow.
• For deeper tunnels, inject in stages, waiting for the liquid to seep down before continuing.
• Treat multiple holes individually; do not miss any.
• For shallower tunnels, chisel open a short section along the tunnel, clean it, spray directly, then seal.

Step 4: Seal the holes

After injection, plug the holes with wooden dowels or putty to prevent rapid evaporation of the insecticide and to prevent new adults from emerging.

Step 5: Observe effectiveness

Check after 1-2 weeks:

• Are there still new wood shavings?
• If yes, there are still active larvae; re-treat.
• If no, treatment was effective.

How many treatments are needed?

House longhorn beetle larvae have a long development period; one treatment may not kill all stages. It is recommended to recheck and re-treat after 2-4 weeks. Spring and summer (April-September) are the best periods for treatment, as larvae are active and the insecticide penetrates tunnels more effectively.

Post-treatment assessment

Mild damage (only 1-2 holes): local injection is sufficient.

Moderate damage (multiple holes, but beam structure intact): treat every hole; may require 2-3 treatments.

Severe damage (beam extensively hollowed): after injecting to kill larvae, a professional builder should assess whether the beam needs replacement. A damaged load-bearing beam may already be unsafe.