Subterranean termites: the integrated 3-level intervention plan

Species: *Reticulitermes lucifugus* (Rossi, 1792) — the most widespread subterranean termite in Italy. Order Isoptera, social castes.

Caste organisation:
• King and queen: live in the underground primary nest. A queen can produce hundreds of thousands of eggs over 20 years.
• Workers: 80% of colony, dig galleries and feed on cellulose. Blind, depigmented.
• Soldiers: 10-15%, developed mandibles for nest defence.
• Nymphs: developing juveniles, plastic caste.
• Alates: reproductives swarming in spring (March-May) to found new colonies — their appearance in the house is the first visible sign.

Cryptic behaviour: *R. lucifugus* never emerges to light. It moves inside saliva-cemented soil galleries connecting the underground nest to surface cellulose sources. Damage advances from inside the wood outwards: the surface looks intact while the interior is completely hollowed out.

Damage speed: slow but inexorable — a consolidated colony can compromise a load-bearing beam in 2-5 years. Non-inspectable areas (closed attics, cavities, wall supports) are most at risk.

Regulatory framework:
• D.Lgs. 150/2012 (sustainable pesticide use).
• EU Reg. 528/2012 — Biocides (BPR).
• Italian PMC (Medical-Surgical Aids) registered products.
• EC Reg. 1907/2006 (REACH) — SDS.
• D.Lgs. 81/2008 — operator safety.
• EU Reg. 2016/425 — Cat. III PPE.

Products and actives:
• Microencapsulated fipronil (phenyl-pyrazole): non-repellent, transferred by trophallaxis, domino effect on the whole colony including queen.
• Microencapsulated imidacloprid (neonicotinoid): non-repellent, soil residuality 6-12 months.
• Bifenthrin / Permethrin (pyrethroids).
• Diflubenzuron / Noviflumuron (IGR — Insect Growth Regulators).

Why non-repellent technology matters: a repellent product creates a barrier that termites bypass. Non-repellent products (fipronil, imidacloprid) are not detected by termites: they cross them, carry them to the nest by trophallaxis and diffuse them through the whole colony, including reproductive castes.

Microencapsulated tech: polymer microcapsules trap the active and release it in a controlled way — low volatility, long residuality (6-12 months), lower operator/inhabitant exposure.

🌳 LEVEL A — External focus remediation (stumps, dead logs in the park or garden):
• Generous spraying with microencapsulated insecticide.
• Direct injection into the stump at 15-20 cm intervals.
• Treatment of surrounding soil (80-100 cm radius).
• If possible: full mechanical stump + root removal.
• If not possible: repeat treatment at 6 months.

🏠 LEVEL B — Perimeter chemical barrier:
• Perimeter trench (10-15 cm depth × 15-20 cm width) continuous around the structure.
• Generous spraying with non-repellent fipronil or imidacloprid.
• Treated-zone width: 30-50 cm from wall.
• Direct injections into perimeter termite mounds.
• Localised injections at corners, foundations, pipe entries.

🏚️ LEVEL C — Internal structural treatment (attic, beams):
• Cavity injection between attic floor and roof.
• Beam injection holes (Ø 8-10 mm, depth 5-8 cm, 45° angle). Sealed with wood plug or filler.
• Surface treatment of all exposed beams.
• Priority focus on critical structural nodes: beam heads embedded in masonry, supports, purlins, moisture areas.
• IGR cellulose-bait monitoring stations.

📅 Schedule:
• T0: integrated A+B+C intervention in 1-2 working days.
• T0 + 4 weeks: phone verification with client.
• T0 + 6 months: verification survey, station inspection, reinforcement if needed, release of intervention certificate.

Expected outcome: foraging stop 24-72 h · colony collapse 4-8 weeks (domino) · visible activity gone 2-3 months · certified eradication at 6 months · annual monitoring afterwards.

Operator PPE (EU Reg. 2016/425, cat. III):
• Tyvek suit type 5/6 · A2P3 mask · nitrile gloves · anti-splash goggles · footwear.

Resident instructions:
• Pre-intervention: clear attic, cover food, animals out for the day.
• Internal post: ventilate 2-4 h, re-entry after 4-6 h (kids 6 h, animals 24 h).
• External post (barrier): no irrigation 24-48 h, no digging in perimeter for 30 days.

Contractual warranty:
• Free verification survey at 6 months.
• If residual activity: reinforcement at no extra cost within contract limits.
• Stamped and signed intervention certificate.
• Limitations: re-infestation from unrelated colonies, pre-existing damage, lack of access to third-party external foci.

🚨 Priority recommendations:
1. Perimeter moisture control: dry perimeter, efficient gutters.
2. No wood-soil contact: never stack firewood against walls.
3. Remove or treat stumps and dead wood on property.
4. Report alate swarms in spring (dark winged insects, 7-10 mm).
5. Report new soil galleries.
6. Don't break the chemical barrier: 12 months, avoid digging within 50 cm of wall.
7. Annual monitoring recommended.

🛑 Alarm signals — call Hygiene Care immediately:
spring alates · new soil galleries · wood sounding hollow · frass piles · new beam cracks.