Search results
149 results found
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Acute oak decline symptoms
Video • 00:02:57
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Step 4 - Crown signs and symptoms
Video • 00:09:29
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Blog
2017 Training Observatree volunteers
Despite the best efforts of Storm Doris, Observatree year four volunteer training days ran smoothly over the course of February and March.
Suzanne Sancisi-Frey • 03 Apr 2017
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Blog
From Lens to Lab: The Power of Photography in Tree Disease Identification
David McKellar discusses the importance of photography in our diagnostic process and offers some guidelines for using our TreeAlert system to report suspected tree pests and diseases.
David McKellar • 22 Aug 2024
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Blog
10 highlights from the past 10 years of Observatree
Professor Nicola Spence, Chief Plant Health Office at Defra, reflects on 10 achievements and successes from the first 10 years of the ground-breaking Observatree initiative.
Nicola Spence • 01 Oct 2023
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Blog
Pine Processionary Moth: Assessing the threat
PPM are spreading further north across Europe but are not established in the UK. We discuss the signs and symptoms to look out for.
Fritha West • 31 Mar 2022
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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
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Pests and diseases
Pests and diseases by tree species
To make it easier for you to spot tree pests and diseases, we have listed our 22 priorties by main host tree species.
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Pests and diseases
Asian Longhorn Beetle
Native to Eastern China, Japan and Korea, this beetle can infest a wide variety of trees with beetles emerging from spring onwards.
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Pests and diseases
Elm Zigzag Sawfly
Elm zigzag sawfly larvae can defoliate whole elm trees leaving them vulnerable to further attack.