Tree disease? Not in my back garden...

The UK is at risk of losing millions of trees to pests and diseases which could seriously damage our gardens, landscapes and impact our wildlife populations.

Whether in your garden, lining your street or abundant in local parks and woodland, trees offer a range of physical and mental health benefits: from gentle exercise and connecting with nature, to combatting air and noise pollution. Or simply offering you some shade.

Observatree is a project that aims to help protect UK trees, woods and forests from new pests and diseases through early detection and reporting. Early detection gives us the highest chances of controlling or monitoring any outbreaks.

Monitoring the spread of tree pests and diseases is equally important. By knowing where something is and when it arrives could highlight trees or areas of the UK with natural resistance.


We need your help

While you are out and about, keep your eyes open for signs of three key pests and diseases, which are threatening some of the UK’s most iconic tree species.


Chalara ash dieback

Affects: ash

First UK recording: 2012

2018: Found across 45.4% of the UK (Source: Forestry Commission)







Sirococcus blight of cedar

Affects: cedar

First UK recording: 2013




Oriental chestnut gall wasp

Affects: sweet chestnut

First UK recording: 2015




To help you, we have produced free, downloadable toolkits including:

·         Identification guides

·         Reporting checklists

·         Questions and answers

Download your toolkit today, visit: