Tree Biosecurity: Why Contractors Clean Down Between Jobs

Where the risk actually sits

Phytophthora species travel in wet soil and water, bark beetles travel in unseasoned logs and bark, and fungal spores travel on damp sawdust and chip. Most of this movement is accidental and avoidable. Cleaning saw chains, brushing down boots and not carting soil between sites removes much of the risk at no real cost.

• Buy firewood locally and do not transport logs long distances.
• Ask whether infected material will be chipped and kept on site or disposed of appropriately.
• Check new nursery stock carefully before planting it near established trees.

What good practice looks like on your job

A contractor should be able to say how chainsaws and chippers are cleaned, where waste is going and whether any part of the tree needs to stay on site. Where a notifiable pest is suspected, work should pause and the sighting should be reported rather than quietly cleared away. Restrictions can change — trade restrictions for Phytophthora pluvialis were lifted across several English counties in 2026 — so current guidance is worth checking at the time of the work.

How James David Forestry Ltd can help

James David Forestry Ltd works across Liverpool, Merseyside, Wirral, Ormskirk and Lancashire. We assess the actual tree, access and surroundings before recommending work. Clear photographs can be useful for initial guidance, but some questions need a site visit and we will not diagnose a dangerous or diseased tree from website information alone.