Search Observatree

Chalara dieback of ash - winter symptoms

Video • 00:01:35
Citrus longhorn beetle - Short video

Video • 00:02:56
Great spruce bark beetle management

External link
Acute oak decline symptoms

Video • 00:02:57
Dothistroma needle blight poster

PDF • 5.99 MB
Chalara ash dieback poster

PDF • 721 KB
Video

Horse Chestnut Webinar - September 2021

a

00:30:48
Blog

State of the World’s Plants

I had the pleasure of attending a ‘State of the World’s Plants’ symposium in May at Royal Botanic Gardens, Kew.

Charles Lane • 14 Aug 2017
Blog

An update on pests and diseases and our plans for 2019

All of the pests and diseases mentioned above emphasise the additional threats to our trees, the continued need for high levels of vigilance and the importance of a tree health early warning system.

Peter Crow • 23 Jan 2019
Blog

Dynamics of the Horse Chestnut Leaf Miner

Have you noticed that, by mid-summer, the leaves of the Horse Chestnut often have brown splotchy marks making the tree look like it’s in autumn colours already?

Phil Scott • 16 Sep 2015