Tree Diseases Explained

Just like every living thing on this planet, trees are also, unfortunately, susceptible to disease. A tree that lacks either light, water, nutrients or carbon dioxide will struggle to stay healthy and thus be under stress, making it weak and open to contracting diseases. Environmental factors can play a big part in a tree’s health, which means particular seasons can increase the risk of them catching certain types of disease. 

This month, Artemis Tree Services will be covering what to look out for when diagnosing a tree disease.

Anthracnose tree disease as seen on the leaf
(Anthracnose disease)

Common Tree Diseases

Acute Oak Decline. This disease has affected thousands of oak trees in Britain. It became present in trees situated in drought-prone locations, where the pollution levels were high. Symptoms of AOD include black fluid oozing from the tree trunk where there’s missing bark or minor damage. 

Anthracnose. This disease typically targets ash trees, oak trees, maple trees, sycamore trees and other similar types of tree. To identify if your tree has Anthracnose, look for burnt-looking leaves or retreating branches if the tree is extremely weak.

Dothistroma Needle Blight. This fungus usually rears its ugly head in June/July time and changes the colour of the needles of a tree from green to yellow, and later on down the line, red. The affected needles will then begin to shed early.

Phytophthora Lateralis. First identified in 2010, UK, this disease causes tongue-shaped breakages in the bark and bleeding on the outside of the bark, which indicates more lesions underneath. Another sign to look for is red/brown leaves.

Phytophthora Austrocedri. This is a pathogen that discolours and kills off the foliage. Look out for cinnamon-brown coloured wounds on the branches or under the bark of juniper trees.  

Rust. This fungal disease affects the leaves of poplar trees, oak trees, ash trees, birch trees, maple trees and plum trees. To identify the fungal disease, you’ll spot small orange lumps that are full of powdery spores present on the leaves. You’re likely to spot this during the summer months, around August time.

Sirococcus Tsugae. Affects trees including atlas cedar, deodar cedar, cedar of Lebanon, western hemlock, eastern hemlock and mountain hemlock, across the UK. The symptoms include the changing of needle colour from green to brown or pink, fungus on needles and dying seedlings. 

Sweet Chestnut Blight. This fungus enters a tree’s wounds and fissures, and its symptoms include cracks in the bark, stem girdling, wilted brown leaves and orange growths on the bark.


How to tell your tree is in poor health – signs to look out for 

  • Bark abnormalities – visibly deep cracks or holes can be a sign of disease
  • Decay – mushrooms or fungus growing on trees can be a sign of disease
  • Dead branches easily broken and dry branches can be a sign of disease
  • Unusual leaf discolourationleaves changing colour before autumn can be a sign of disease
  • Growing at an anglea lopsided tree can be a sign of disease or damage

 


If you spot any obvious tree defects, call a local professional who will be able to assist you. Artemis Tree Services serve customers throughout the Hertfordshire areas, providing a reliable and professional service, whatever job we take on. To arrange a free site visit from our tree surgeons, simply contact our friendly team to discuss your project further.

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Michelle Hyer

Excellent service, tidy, efficient, on-time and someone at the end of the phone for queries! I would highly recemmend x...

1 day ago

Barbara M Grant, Rickmansworth, Hertfordshire

Artemis Tree Services Limited is a professional tree surgeon and is highly recommended. The marketplace is peppered with charlatans purporting to be qualified in this specialist area but Artemis con... Artemis Tree Services Limited is a professional tree surgeon and is highly recommended. The marketplace is peppered with charlatans purporting to be qualified in this specialist area but Artemis continues to uphold and deliver the professional status of this important skill. They offer a a high quality service from the very first contact through to delivery of a clean and crafted conclusion. I have no hesitation in recommending their outstanding service. Many thanks to all involved.

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Blake Lewis

The contractors that came to prune my tree were very efficient, polite and effective and I would have no hesitation in recommending Artemis to anyone.... The contractors that came to prune my tree were very efficient, polite and effective and I would have no hesitation in recommending Artemis to anyone.

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Jo

Just to say thank you for carrying out the work so professionally. The team were efficient, they took great care to ensure nothing got damaged, they were very friendly and informative and left the ar... Just to say thank you for carrying out the work so professionally. The team were efficient, they took great care to ensure nothing got damaged, they were very friendly and informative and left the area tidy. Work carried out: Removal of deadwood

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4 months ago

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very professional, knowledgeable company. where able to provide advice and options as to needed to be done. Clean, tidy and polite...

4 months ago

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Very professional We have used them a few times and would not go anywhere else...

4 months ago

Francis Emmanuel

This was the second time we used the services of Artemis Tree Services. This time it was to fell and remove a mature sycamore. The team were excellent throughout - from initial enquiries, advice with ... This was the second time we used the services of Artemis Tree Services. This time it was to fell and remove a mature sycamore. The team were excellent throughout - from initial enquiries, advice with what was suitable, scheduling of the work, the tree work itself, the disposal of the felled tree and invoicing. Very pleasant, smart, tidy and courteous.

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Excellent service from the initial contact to completion. Professional ans polite at all times. Many thanks for this wonderful experience. Regards Pools Sritharan 18, The Avenue, Potters Bar.... Excellent service from the initial contact to completion. Professional ans polite at all times. Many thanks for this wonderful experience. Regards Pools Sritharan 18, The Avenue, Potters Bar.

5 months ago

Wendy Fry

Very pleased with work done to prune large sycamore tree. Detailed quote provided same day as Billy came to inspect and advise. All work was done promptly, safely with no mess whatsoever. Would defini... Very pleased with work done to prune large sycamore tree. Detailed quote provided same day as Billy came to inspect and advise. All work was done promptly, safely with no mess whatsoever. Would definitely recommend this firm. Very professional from start to finish.

5 months ago

Chris Pooley

If you require any tree work done I can certainly recommend Artemis. The estimator Billy was great to deal with professional and gave great advice. We required a Laurel and Holly tree to be reduced i... If you require any tree work done I can certainly recommend Artemis. The estimator Billy was great to deal with professional and gave great advice. We required a Laurel and Holly tree to be reduced in height and shaped and several leylandia trees at the back of the garden to be reduced in height and tidied up.A detailed quote was provided within 24 hours. On the day of the scheduled work the crew arrived on time and Tom and Charlie did a fantastic job very courteous and making sure everything was left nice and tidy. I would have no hesitation in contacting them for any future work required this is an extremely well run business.

5 months ago

Wendy Farrell

Great service from the get go. Surveyor was brilliant and took his time advising me on the best value for money for the job. The two guys in the day were fab! Not a leaf was left for me to tidy up. K... Great service from the get go. Surveyor was brilliant and took his time advising me on the best value for money for the job. The two guys in the day were fab! Not a leaf was left for me to tidy up. Kirstie Harvey in the office is a legend! Cannot recommend this company highly enough.

6 months ago

Kirk Teasdale

Delighted with the work carried out by what I can only describe as absolute gentlemen. They were prompt, courteous and considerate through out. Would definitely recommend.... Delighted with the work carried out by what I can only describe as absolute gentlemen. They were prompt, courteous and considerate through out. Would definitely recommend.

6 months ago

Mark Stafford

As a retired arborist myself I cannot give this company higher praise. Reasonable quote for the work and their climber was very proffessional and worked in a safe manner. Site was spotless when they l... As a retired arborist myself I cannot give this company higher praise. Reasonable quote for the work and their climber was very proffessional and worked in a safe manner. Site was spotless when they left. All in all a very pleasant experience.

6 months ago

Anonymous

Everything was great from start to finish I highly recommend Artemis. From the initial quotation to the reminders and then the text on the day to say they were on their way everything was perfect. T... Everything was great from start to finish I highly recommend Artemis. From the initial quotation to the reminders and then the text on the day to say they were on their way everything was perfect. The chaps onsite were great, very polite and incredibly tidy. I am very happy with the standard of work and would definitely recommend.

7 months ago

Nick Woolford

From the initial contact through to the finished work, everything has gone smoothly and professionally. The estimator came when he said he would, gave us meaningful and thoughtful suggestions. His d... From the initial contact through to the finished work, everything has gone smoothly and professionally. The estimator came when he said he would, gave us meaningful and thoughtful suggestions. His detailed estimate was produced within hours of his visit. Once we had accepted the estimate we received planned date for the work. On the day the workmen arrived when we were told they would. They were extremely co-operative, helpful and informative. The work procedure without a hitch with everything being competed to a high standard, and all the refuse removed, leaving the garden neat and tidy. We will have Artemis back later in the year to prune the fruit trees.

7 months ago

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A fantastic service, at good reasonable prices with total clearace of the site upon completion. Couldn't ask for more....

8 months ago

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Just had a tree removed in Ruislip Manor, the guys were done and dusted in just over an hour, I was expecting a mess that I'd have to clean up once they left. The guys ensured everything was spo... Just had a tree removed in Ruislip Manor, the guys were done and dusted in just over an hour, I was expecting a mess that I'd have to clean up once they left. The guys ensured everything was spotless when they left. We're all happy, but my Cat missing the tree!

8 months ago

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Great job start to finish. All contact smooth and easy. The team listened to everything we wanted and pulled it off to perfection. Very neat and tidy too! Thank you very much!... Great job start to finish. All contact smooth and easy. The team listened to everything we wanted and pulled it off to perfection. Very neat and tidy too! Thank you very much!

8 months ago