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 la protection du bois depuis plus de 35 ans

Insects with xylophagous larvae

CAPRICORN (Hylotrupes bajulus)

insecte-capricorneTarget :

  • Sapwood.

Damages :

  • Shafts and galleries parallel to the wood thread wherein wood dust is present.
  • 5 - 10 mm oval-shaped exit holes.

Appearance :

  • Larvae :
    • 20 - 25 mm long, ivory-white colour (larval cycle 3-5 years).
  • Adults :
    • 10 - 20 mm long , deep brown colour.
    • Lifetime : 2 - 3 weeks.
    • Egg laying : 40 - 100 eggs.

VRILLETTE (Anobium punctatum, Xestobium rufovillosum)

Target :

  • Lumber (softwood and hardwood) often infested by rot fungus.

Damages :

  • Shafts and galleries parallel to the thread of wood.
  • 1 - 3 mm round exit hole (4 mm for the deathwatch beetle).

Appearance :

  • Common furniture beetle :
    • Larvae
      • Arched body, 5 - 7 mm long, white colour.
      • Larval cycle : 1 - 4 years.
    • Adults
      • 2,5 mm - 5 mm long, deep brown colour.
      • Lifetime : 3 - 4 weeks.
      • Egg laying : 20 - 30 eggs.
  • Deathwatch beetle :
    • Larvae
      • Arched body, 6 - 11 mm, white colour.
      • Abundant hair.
      • Larval cycle : 1 - 10 years depending on the level of fungal attack.
    • Adults
      • 5 - 7 mm long.
      • Deep brown colour with tufts of yellow hair.
      • Lifetime : 9 weeks.
      • Egg laying : 100 eggs.

LYCTUS (lyctus linearis ou brunneus)

Target :

  • Hardwood (including tropical woods).

Damages :

  • Numerous shafts and galleries blocked with sawdust.
  • 1 - 2 mm round exit holes.

Appearance :

  • Larvae :
    • 5 - 7 mm long, white colour.
    • Larval cycle : 8 - 12 months.
  • Adults :
    • 3 - 6 mm long, reddish brown body.
    • Lifetime : 2 - 6 weeks.
    • Egg laying : approx. 20 eggs.

Nesting insects

CARPENTER BEE (Xylocopa violacea)

Hymenopteran xylocopa

Target

  •    Any soft wood species (hardwood and softwood)

Damages

  •   Large galleries of 10 - 15 mm diameter and up to 45 cm long
  •   Woodchips are rejected ou of the timber

Appearance

  •   Visual : looks like a bumblebee
  •   Colour : black body with purplish wings
  •   Size : 20 - 25 mm long

ANTS (Hymenopteran formicidae)

Target

All wood species may be attacked by ants. However, ants will prefer to aim woods which have been already faded by fungi.

Damages

  • Tunnels and galleries : large cavities with clear and smooth finished walls without worm-hole
  • Wood chips and remains of insects are rejected outside

Appareance

  • Will vary according to the species
  • Camponotus herculeanus : 7 - 14 mm long, reddish brown colour
  • Lasius niger : 2 - 4 mm long brown colour
  • Lasius fuliginosus : 3 - 5 mm long, bright black colour

Treatment against insects and xylophagous larvae

Each case requires a specific treatment. However, these processes are complex and only skilled professionals should be contracted.

PROCESS :

PREPARATION STAGE

  • Probing the timbers : Run a mechanical check of the timbers to detect mines and galleries.
  • Chopping the damaged timbers : everywhere and infestation has been detected, get rid of the damaged wood and remain only with the sound wood exposed.
  • If ever the mechanical resistance of the timber appears to be weaker than expected, double-check with a certified architect.
  • Brushing and cleaning : brush and clean any mine/gallery to evacuate frass in order to ease the product penetration into the treated area.

TREATMENT STAGE

At this stage, a biocide will be used to stop larval development and prevent new egg layings.

2 routes are possible for treatment :

  • Injection and spraying of liquid biocidal products
  • Coating of surface by biocidal gels (specific cases)

In both cases, timbers and wood in contact with masonry (brick walls, concrete blocks) will be treated by injection.