Chestnut Problem

Tim Craig · 3rd September 2007, 09:53 AM

Hi guys

I looked at a Horse Chestnut today that had cankers all the way round it's circumference. It also has chestnut leaf blotch - Guidnardia aesculi.

The client wants to save it, I said I may be able to prolong it's life by lifting the turf around it and replacing with fertilizer and mulch. No pruning is needed.

The cankers will be choking the vascular system or at least restricting the flow of nutrients up, sugars down etc.

I also suggested complete removal and replace with new trees.

Is there anything else I could do?

The client

loves her tree.

Sean Freeman · 3rd September 2007, 03:09 PM

I take it (since you make no mention of it) that there are no targets under this tree or within the impact zone if it were to fail at the base??

More information required Tim...pics would be nice too.

Eric Frei · 3rd September 2007, 06:32 PM

Forestry Commission - News - horse chestnut survey launched

http://www.forestry.gov.uk/pdf/bleed...dingcanker.pdf

Forest Research - Bleeding Canker of Horse Chestnut - Advice on disease management

From what I have read sounds like you're flogging a dead horse.

Although improving health and vigour will delay it appears no remedy in sight and the problem in UK is on the rise etc.

Just the way nature goes sometimes Tim, the more information you have and research the more likely your customer is to know the outcome. Seems to have stumped the experts too.

In this post you can see another of our usually tough cadaghi's dropped dead. Eric Frei's pics

Fungal cankers, the eternal enemy of trees.

Sean Freeman · 3rd September 2007, 07:50 PM

Lets not loose sight of the fact that cankers are secondary factors in tree decline, trees and cankers have evolved together of millions of years, and for each individual tree the presence of fungal spores outside and inside their tissues is a constant pressure with which they have to deal.....being able to identify and at least manage if not treat the primary causes, now thats the aim.

Eric Frei · 3rd September 2007, 11:22 PM

Funny thing about it is why do some trees succumb and others not, like the two I had side by side.

And why is there all of a sudden an epidemic when there never was before?

30 kids in a class, all exposed to a cold virus, some kids have time off, some get the sniffles and some dont get anything. Scientists still haven't worked it out, they have tried diets, fitness etc but there's no real 100% nailed answer.

Pics would be ideal for this one, also that canker is not just nailing the old trees over there, search Google a bit and you'll see it's taking young ones out to, so somethings going on.

Lee Winger · 4th September 2007, 01:54 AM

The tree has phytothora [bleeding cankers] no need to TD it simply requires a good PHC man, it will require decompaction and macro and micro nutrient injection..

Tim Craig · 4th September 2007, 02:09 AM

Quote:

Originally Posted by Sean Freeman

I take it (since you make no mention of it) that there are no targets under this tree or within the impact zone if it were to fail at the base??

More information required Tim...pics would be nice too.

Pavement on one side of the tree, the tree is stunted after years of hacking abuse.

It's a sad looking tree alright. I'll get a photo, but be prepared to be shocked by the pathetic specimen of treehood you will see. Poor bugger.

Tim Craig · 4th September 2007, 02:10 AM

Quote:

Originally Posted by Ekka

Forestry Commission - News - horse chestnut survey launched

http://www.forestry.gov.uk/pdf/bleed...dingcanker.pdf

Forest Research - Bleeding Canker of Horse Chestnut - Advice on disease management

From what I have read sounds like you're flogging a dead horse.

Although improving health and vigour will delay it appears no remedy in sight and the problem in UK is on the rise etc.

Just the way nature goes sometimes Tim, the more information you have and research the more likely your customer is to know the outcome. Seems to have stumped the experts too.

In this post you can see another of our usually tough cadaghi's dropped dead. Eric Frei's pics

Fungal cankers, the eternal enemy of trees.

Great info Ek, thanks. Damn cankers everywhere on chestnut these days.

Tim Craig · 4th September 2007, 02:12 AM

Quote:

Originally Posted by Roller

it will require decompaction and macro and micro nutrient injection..

Decompaction I can do with the vertical mulching technique, but what specific injection are you thinking of and who uses it in the UK? examples, where can you buy it.

Eric Frei · 4th September 2007, 06:51 AM

Why are all these chestnuts getting cankers?

Sean Freeman · 4th September 2007, 07:44 AM

Tim its inadvisable to apply treatments without knowing exactly what it is you are dealing with...you really need to take comprehensive soil root and leaf samples and have them assayed to establish just what is going on in the soil food web. Its more difficult for you being in the UK, but get friendly with some microbiologists at your local uni or college...over here we use SFI labs, they're also set up in the US, but not in the UK as yet.

Even very serious infections are treatable with antagonistic fungal combinations, boosting the beneficial microfauna and flora of the soil also has major benefits for tree health and vigour without the very negative impacts of fertilisers...personally I would caution against fertilising declining trees.

Application of the identified fungi and fungal foods can be done through soil drenching and foliar sprays including the bark.

Shigo used to often comment that when he was touring around the world delivering presentations he would be presented with numerous cases of "new pathogenic plagues" be they fungi or bacteria, his feelings were that these fungi if exotic to the region/country could move rapidly through tree populations previously unexposed to that strain, but that the biology of trees has evolved to deal with the mechanisms of infection utilised by both fungi and bacteria, and what was being observed by Arborists was not some previously unknown natural pathogen but rather the culmination of a range of factors driven most forcefully by the impact of human activities.

Phytophora is a real problem everywhere in the world for those who plant grow and manage vegetation, but its life cycle is understood. Limiting its impact on tree populations is possible I believe, but dependant on how much resource is to be committed to that effort....to some degree comes back around to the oft discussed issue of when is a tree no longer worth retaining.

Lee Winger · 4th September 2007, 10:27 AM

Quote:

Originally Posted by Tim Craig

Decompaction I can do with the vertical mulching technique, but what specific injection are you thinking of and who uses it in the UK? examples, where can you buy it.

The tree will eventualy die, as the the fungus will ring the tree and stop the phloem, are the leaves yellow? loads of Horse chestnut have the problem , the trick is to act now before other fungi start to attack, Armillaria is a prime fungus that will move in for the kill when a tree is stressed.

If you can verticle mulch, all good, then simply soil drench with the product I use, by injection I mean root/soil injection with a deep root feeder.

I'll send you a pm regarding the product I sell to a select few, I bought a load in bulk, I don't sell for profit,Tim I carry out all types of decompaction work and nutrient injection, air-spade work etc..

If any other Brits need any advice on the purchase of soil conditioners PM me

Sean is right about being cautious fertlizing stressed trees, but I would add ' nitrogen' is by far the worst thing for this tree, my fert contains micro-nutrients, myccorhizae spores [just in case lol], and cleated iron..

dogweed · 6th September 2007, 07:14 AM

I listened to Dr Joan Webber from the UK's Forest Research the other day. The bleeding cankers affecting horse chestnuts in the UK at present are mostly not Phytophera, but Pseudomonas syringae pathovars. Little is known about the pathology of the problem and I would suggest that rushing in and deep mulching, fertilising or pretty much anything else is not wise given how little is understood.

Whilst the prognosis is not good, Dr Webber has seen horse chestnuts infected arrest their decline and live.

It was suggested that if felling / pruning tools should be sterilised afterwards and care should be exercised in the disposal of arisings.

matty f · 6th September 2007, 08:00 AM

not nice this disease! also chesnut leaf miner is also ravaging trees around my way.
some few trees ive found with it recover mostly all others dont ,as soon as you notice any form of trunk gurdling remove it as ive been called out to a few that the stems have snapped due to the nature of the dead and alive wood of horse chesnut not been a good supportive structure for a whole tree crown.

Ive tryed repollarding old pollards that had not been touched for 10+ years as only the regrown stems where gurdled,they came back nice but now have horse chesnut leaf miner on the regrowth! I also pollared a mature one that was badly infected and had started gurdling as the customer did not want it felled and hoped the mutalated tree might produce some regrowth that would eventually develope in to a new crown but that died or is very close at the moment, all the other badly infected ones ive come across have been felled,i have tryed pruning out infected branches this seems to be working but there is still weeping legions on the trunk wich to me dont look a good sighn ......ive also found phytopher recently on a few birch ,maples and beach........hey roller do you remember that beach tree i showed you at the top of mr prices garden?im pretty sure thats phytophera have a look when you get up there

Eric Frei · 6th September 2007, 08:43 AM

Sounds bad, got a lot of people stumped.

What about weather, has it been peculiar for say the last 2 to 3 years?

Nothing works on it, all fungicides fail, maybe if you guys can have a few in different locations try some different techniques.

Over here our usual tough as nails mango trees have been looking pretty ordinary, seems the tips affected by fungal problems. I tried phosphite and I tried macozeb, the fungus is anthracnose. Now the instructions said phosphite wont work on anthracnose but that mango tree did better than the one I used macozeb on.

But there exists another problem hard to control, possums eating off the juvenile foliage keeping the tree defoliated, then pests move in. So I treated with confidor, got rid of the bugs but the possums were still a problem.

I found this interesting article, in this article you can see it wiped the indigenous tree population out and a new resistant species is being introduced.

ScienceDaily: Chestnut Trees To Spread Across Landscape Again, Says Purdue Scientist

Lee Winger · 7th September 2007, 08:13 AM

Quote:

Originally Posted by dogweed

I listened to Dr Joan Webber from the UK's Forest Research the other day. The bleeding cankers affecting horse chestnuts in the UK at present are mostly not Phytophera, but Pseudomonas syringae pathovars. Little is known about the pathology of the problem and I would suggest that rushing in and deep mulching, fertilising or pretty much anything else is not wise given how little is understood.

Whilst the prognosis is not good, Dr Webber has seen horse chestnuts infected arrest their decline and live.

It was suggested that if felling / pruning tools should be sterilised afterwards and care should be exercised in the disposal of arisings.

How can decompaction and or verticle mulching etc not be good for a stressed tree?

dogweed · 7th September 2007, 08:20 AM

By benefiting the pathogen more than it benefits the tree.

Lee Winger · 7th September 2007, 09:18 AM

Quote:

Originally Posted by dogweed

By benefiting the pathogen more than it benefits the tree.

Humm i'n not going to disagree with you, but i'll have to mull over that one..

Eric Frei · 7th September 2007, 02:51 PM

Fungi is a bugger to kill.

I did a whole load of hunting around and an old school method was peroxide and bleach.

dogweed · 7th September 2007, 06:12 PM

Pseudomonas syringae, which has now been identified as the pathogen behind the canker problems in northern Europe, is a bacteria, not a fungus.

Eric Frei · 3rd April 2008, 10:51 PM

Bump from this thread back to here.

http://www.treeworld.info/f2/new-dis...nuts-2021.html

TreeSpecialist · 4th April 2008, 07:17 AM

Fungi (most all types) can and do overwhelm other pathogens - primarily bacteria and weaker, though often fatal, fungal species.

They are part of the overall pattern of tree death and decomposition.

Since this article now identifies a bacteria, could this not have been the problem all along?

Millions of conker trees face being wiped out by deadly new disease | the Daily Mail

And to treat bacterial infections, one would use antibiotics. Wonder if anyone has tried that approach?

Eric Frei · 1st March 2009, 12:37 PM

A solution may have been found.

Conquer™ - Hope for Britain's Horse Chestnut Trees

Quote:

JCA Limited, in partnership with Allicin Tree Care in The Netherlands, have developed a new product, Conquer™, which, when introduced into the tree using a unique infusion method provides a breakthrough in the fight against Bleeding Canker in Horse Chestnut trees with applications for many other tree and shrub diseases. JCA Limited is launching a treatment service in March 2009 after extensive tests in The Netherlands which produced remarkably encouraging results.

Eric Frei · 28th April 2010, 02:21 PM

More news

BBC News - DNA boost in battle against bleeding canker

Quote:

A team of UK scientists hopes to shed light on the mysteries of bleeding canker, a disease that is threatening the nation's horse chestnut trees.

The researchers have sequenced the genome of a strain of bacterium that causes the virulent infection.

A survey in 2007 showed that bleeding canker had spread rapidly, with almost half of the two million horse chestnuts displaying symptoms of the disease.

The findings have been published in the journal PLoS One.

A visible symptom of the disease is a lesion on the bark, which oozes a resin on to the trunk or sometimes the branches.

The bark underneath the canker is killed, and if cankers manage to go all the way around the trunk then the horse chestnut (Aesculus hippocastanum) will die because it cuts off the food supply.
'Single introduction'

The researchers sequenced the genome of the bacterium Pseudomonas syringae pathovar aesuli (Pae) from three samples collected from different locations within the UK. They compared them with samples from the only other recorded case, taken from an Indian horse chestnut in India in the 1960s.

"What we found was that the three British samples were all identical," said co-author Dr David Studholme, currently at the University of Exeter but who was based at The Sainsbury Laboratory, Norwich, while during the study.

"This means that they all probably descended from a single introduction," he told BBC News.

However, he added that more work was needed before they could say whether or not the bacterium originated from India, where the pathovar (a strain of bacterium that only affects certain plants, in this case horse chestnuts) was originally recorded.

"The Indian [specimen] has only ever been known to cause a leaf spot; there is no evidence of it causing cankers."

Dr Studholme's fellow co-author was Sarah Green, a plant pathologist at Forest Research, the research wing of the UK Forestry Commission. She said Pae was "very mobile, very aggressive" and that it definitely needed to be studied.

"There were some interesting genes that we found that may well be helping it to be so aggressive," she explained.

"It affects the woody part of the trees, whereas other bacterial diseases attack the soft tissues (such as leaves)."

However, she added that much more work was needed before it would be possible to understand how the bacterial strain interacted with the trees and how it was spread.
Chainsaw reaction

Since Pae was first recorded in 2002, it has become present throughout the UK and more than 70% of horse chestnuts in some areas are showing symptoms of being infected.

Roddie Burgess, head of plant health at the Forestry Commission, said he hoped the research would help develop a strategy to tackle the problem.

"It always takes you by surprise when you investigate a previously unknown disease and find out that almost half of your tree population may already be infected," he told BBC News.

He said that a few thousand trees were known to have been cut down by local authorities amid fears that infected trees would pose a risk to the public.

"Quite a hefty number were felled before we realised that the trees sometimes go into remission and maybe recover.

"Our advice for now is not to go jumping in with a chainsaw."

He added that further research was underway to find out if the disease had the potential to kill the trees in ways other than cutting off the supply of nutrients.

"These are the sorts of things we need to understand before we even begin to think about how best to manage infected trees."

http://media-newswire.com/release_1117375.html

Quote:

(Media-Newswire.com) - Experts from the University of Reading have played a vital role in research that has decoded the genetic blueprint of a disease that is threatening the UK's historic landscape.

The horse chestnut has become an iconic sight in Britain since its introduction in the 1500s but in 2002 a new lethal disease appeared that now infects over 70 per cent of trees in some areas. Bleeding canker, caused by the bacterium Pseudomonas syringae pathovar aesculi ( Pae ), causes lesions which bleed like open sores and in severe cases can kill large mature trees within one to two seasons.

Project leader, Dr Robert Jackson, and his PhD student, Federico Dorati, have been studying the genetic mechanisms responsible for the bacteria which causes Horse Chestnut bleeding canker disease.

They teamed up with other project leaders Prof. Sophien Kamoun and Dr David Studholme ( The Sainsbury Lab ) and Dr Sarah Green ( Forest Research ) to read the DNA code, or genome sequence, of the pathogen. Some of the work done at the University of Reading was deciphering what the genes did as well as carry out experimental tests to prove predictions. The genome sequence will also help Robert and Federico in their aim to find out how the disease is spread between trees.

"Comparing the genomes of British strains of the bacterium has shown us they are very similar and probably originated from a single introduction into the UK within the last few years," said Dr David Studholme who led the analysis of the DNA sequences at The Sainsbury Laboratory in Norwich.

"Detecting the origin of Pae is important from a biosecurity perspective," said Dr Sarah Green, a tree pathologist with Forest Research. "There has been an unprecedented rise in invasive plant diseases, likely due to the rise in international travel and in the global plant trade."

"We now have the first clues to the evolutionary origin of the disease and to its ability to spread so fast. Pae might have been accidentally introduced to Europe through importation in the plant trade. We need to prevent it being introduced to new geographical areas such as North America," said Dr Green.

Before the European epidemic, the only reported case of Pae was in India. A similar strain infects the Indian horse chestnut but causes only minor lesions in the leaves. The strains that emerged in Europe appear to be more aggressive and attack the woody trunk and branches.

"This pathogen spread quickly through Western Europe and Britain and the information from the sequencing will help us discover how it is dispersed," said Dr Rob Jackson from the University of Reading. "It may be that it can cause precipitation so it is swept into the atmosphere before being rained back down in new locations, or it may be carried by some kind of vector such as insects."

The success of the pathogen may be helped by a cluster of genes that help it to acquire iron, an essential nutrient for virulent bacteria. Pae also has an unusual cluster of genes which may be involved in the degradation of compounds derived from woody tissues. A plant will normally produce nitric oxide as part of its defence mechanism, but Pae may have the ability to inhibit this response via two genes identified by the scientists.

The differences between the Indian and British strains give the first clues to its virulence on European horse chestnut. The British strains contain additional genes that enable it to live off the sucrose found in the tree sap.

The genome sequence will allow scientists to determine which genes might be necessary for infection of a tree host so they can be targeted to control the disease.

"Emerging human and animal diseases are routinely sequenced and this research shows the usefulness of doing the same for plant pathogens," says Professor Kamoun from the Sainsbury Laboratory.

"We can quickly generate large amounts of genetic information on emerging plant diseases that is valuable for combating current and future biosecurity threats."

Contacts

TSL Press Office

Zoe Dunford, Tel: 01603 255111, email: zoe.dunford@bbsrc.ac.uk Andrew Chapple, Tel: 01603 251490, email: andrew.chapple@bbsrc.ac.uk

Forest Research press office

Charlton Clark, 0131 314 6500; charlton.clark@forestry.gsi.gov.uk

Paper cited:

Green et al, Comparative genome analysis provides insights into the evolution and adaptation of pseudomonas syringae pv. Aesculi on Aesculus hippocastanum to be published in PloS One.

About the Sainsbury Laboratory

The Sainsbury Laboratory ( TSL ) is a world-leading research centre focusing on making fundamental discoveries about plants and how they interact with microbes. TSL is evolving its scientific mission so that it not only provides fundamental biological insights into plant-pathogen interactions, but also delivers novel, genomics-based, solutions which will significantly reduce losses from major diseases of food crops, especially in developing countries.

About Forest Research

Forest Research is part of the Forestry Commission. It is a world leader in research and development in support of sustainable forestry, and is Britain's principal organisation for forestry and tree-related research. Forest Research conducts scientific research and technical development relevant to UK and international forestry, and which informs and supports the forestry policies of the UK, Scottish and Welsh Assembly Governments .

About the University of Reading

The University of Reading is one of the UK's top research-intensive universities. The University is ranked in the top 20 UK higher education institutions in securing research council grants worth nearly £10 million from EPSRC, ESRC, MRC, NERC, AHRC and BBSRC. In the RAE 2008, over 87% of the university's research was deemed to be of international standing. Areas of particular research strength recognised include meteorology and climate change, typography and graphic design, archaeology, philosophy, food biosciences, construction management, real estate and planning, as well as law.

3rd September 2007, 09:53 AM	#1
Tim Craig Semi-mature vigorous tree Join Date: Feb 2007 Location: Glasgow, Scotland Posts: 130	Chestnut Problem Hi guys I looked at a Horse Chestnut today that had cankers all the way round it's circumference. It also has chestnut leaf blotch - Guidnardia aesculi. The client wants to save it, I said I may be able to prolong it's life by lifting the turf around it and replacing with fertilizer and mulch. No pruning is needed. The cankers will be choking the vascular system or at least restricting the flow of nutrients up, sugars down etc. I also suggested complete removal and replace with new trees. Is there anything else I could do? The client loves her tree.

3rd September 2007, 03:09 PM	#2
Sean Freeman Veteran Heritage Status Join Date: Feb 2007 Location: Townsville Nth Queensland & Gold Coast Sth Queensland Posts: 1,981	Re: Chestnut Problem I take it (since you make no mention of it) that there are no targets under this tree or within the impact zone if it were to fail at the base?? More information required Tim...pics would be nice too.

3rd September 2007, 06:32 PM	#3
Eric Frei Admin - Owner Palm & Tree Services in Brisbane Join Date: Jan 2007 Location: Brisbane Posts: 12,990	Re: Chestnut Problem Forestry Commission - News - horse chestnut survey launched http://www.forestry.gov.uk/pdf/bleed...dingcanker.pdf Forest Research - Bleeding Canker of Horse Chestnut - Advice on disease management From what I have read sounds like you're flogging a dead horse. Although improving health and vigour will delay it appears no remedy in sight and the problem in UK is on the rise etc. Just the way nature goes sometimes Tim, the more information you have and research the more likely your customer is to know the outcome. Seems to have stumped the experts too. In this post you can see another of our usually tough cadaghi's dropped dead. Eric Frei's pics Fungal cankers, the eternal enemy of trees. __________________ Protect your rights to work - Join Australian Tree Association My businesses:- Qualified Brisbane Palm and Tree Lopping \| Stump Grinding Brisbane \| Brisbane - Gold Coast Consulting Arborist

3rd September 2007, 07:50 PM	#4
Sean Freeman Veteran Heritage Status Join Date: Feb 2007 Location: Townsville Nth Queensland & Gold Coast Sth Queensland Posts: 1,981	Re: Chestnut Problem Lets not loose sight of the fact that cankers are secondary factors in tree decline, trees and cankers have evolved together of millions of years, and for each individual tree the presence of fungal spores outside and inside their tissues is a constant pressure with which they have to deal.....being able to identify and at least manage if not treat the primary causes, now thats the aim.

3rd September 2007, 11:22 PM	#5
Eric Frei Admin - Owner Palm & Tree Services in Brisbane Join Date: Jan 2007 Location: Brisbane Posts: 12,990	Re: Chestnut Problem Funny thing about it is why do some trees succumb and others not, like the two I had side by side. And why is there all of a sudden an epidemic when there never was before? 30 kids in a class, all exposed to a cold virus, some kids have time off, some get the sniffles and some dont get anything. Scientists still haven't worked it out, they have tried diets, fitness etc but there's no real 100% nailed answer. Pics would be ideal for this one, also that canker is not just nailing the old trees over there, search Google a bit and you'll see it's taking young ones out to, so somethings going on. __________________ Protect your rights to work - Join Australian Tree Association My businesses:- Qualified Brisbane Palm and Tree Lopping \| Stump Grinding Brisbane \| Brisbane - Gold Coast Consulting Arborist

4th September 2007, 01:54 AM	#6
Lee Winger Semi-mature vigorous tree Join Date: Feb 2007 Location: Suffolk UK Posts: 146	Re: Chestnut Problem The tree has phytothora [bleeding cankers] no need to TD it simply requires a good PHC man, it will require decompaction and macro and micro nutrient injection.. __________________ www.arboraeration.co.uk Tree healthcare specialists covering the UK

4th September 2007, 06:51 AM	#10
Eric Frei Admin - Owner Palm & Tree Services in Brisbane Join Date: Jan 2007 Location: Brisbane Posts: 12,990	Re: Chestnut Problem Why are all these chestnuts getting cankers? __________________ Protect your rights to work - Join Australian Tree Association My businesses:- Qualified Brisbane Palm and Tree Lopping \| Stump Grinding Brisbane \| Brisbane - Gold Coast Consulting Arborist

4th September 2007, 07:44 AM	#11
Sean Freeman Veteran Heritage Status Join Date: Feb 2007 Location: Townsville Nth Queensland & Gold Coast Sth Queensland Posts: 1,981	Re: Chestnut Problem Tim its inadvisable to apply treatments without knowing exactly what it is you are dealing with...you really need to take comprehensive soil root and leaf samples and have them assayed to establish just what is going on in the soil food web. Its more difficult for you being in the UK, but get friendly with some microbiologists at your local uni or college...over here we use SFI labs, they're also set up in the US, but not in the UK as yet. Even very serious infections are treatable with antagonistic fungal combinations, boosting the beneficial microfauna and flora of the soil also has major benefits for tree health and vigour without the very negative impacts of fertilisers...personally I would caution against fertilising declining trees. Application of the identified fungi and fungal foods can be done through soil drenching and foliar sprays including the bark. Shigo used to often comment that when he was touring around the world delivering presentations he would be presented with numerous cases of "new pathogenic plagues" be they fungi or bacteria, his feelings were that these fungi if exotic to the region/country could move rapidly through tree populations previously unexposed to that strain, but that the biology of trees has evolved to deal with the mechanisms of infection utilised by both fungi and bacteria, and what was being observed by Arborists was not some previously unknown natural pathogen but rather the culmination of a range of factors driven most forcefully by the impact of human activities. Phytophora is a real problem everywhere in the world for those who plant grow and manage vegetation, but its life cycle is understood. Limiting its impact on tree populations is possible I believe, but dependant on how much resource is to be committed to that effort....to some degree comes back around to the oft discussed issue of when is a tree no longer worth retaining.

6th September 2007, 07:14 AM	#13
dogweed I'm new here so be nice Join Date: Sep 2007 Location: UK Posts: 3	Re: Chestnut Problem I listened to Dr Joan Webber from the UK's Forest Research the other day. The bleeding cankers affecting horse chestnuts in the UK at present are mostly not Phytophera, but Pseudomonas syringae pathovars. Little is known about the pathology of the problem and I would suggest that rushing in and deep mulching, fertilising or pretty much anything else is not wise given how little is understood. Whilst the prognosis is not good, Dr Webber has seen horse chestnuts infected arrest their decline and live. It was suggested that if felling / pruning tools should be sterilised afterwards and care should be exercised in the disposal of arisings.

6th September 2007, 08:00 AM	#14
matty f Sappling Join Date: Mar 2007 Location: england Posts: 16	Re: Chestnut Problem not nice this disease! also chesnut leaf miner is also ravaging trees around my way. some few trees ive found with it recover mostly all others dont ,as soon as you notice any form of trunk gurdling remove it as ive been called out to a few that the stems have snapped due to the nature of the dead and alive wood of horse chesnut not been a good supportive structure for a whole tree crown. Ive tryed repollarding old pollards that had not been touched for 10+ years as only the regrown stems where gurdled,they came back nice but now have horse chesnut leaf miner on the regrowth! I also pollared a mature one that was badly infected and had started gurdling as the customer did not want it felled and hoped the mutalated tree might produce some regrowth that would eventually develope in to a new crown but that died or is very close at the moment, all the other badly infected ones ive come across have been felled,i have tryed pruning out infected branches this seems to be working but there is still weeping legions on the trunk wich to me dont look a good sighn ......ive also found phytopher recently on a few birch ,maples and beach........hey roller do you remember that beach tree i showed you at the top of mr prices garden?im pretty sure thats phytophera have a look when you get up there

6th September 2007, 08:43 AM	#15
Eric Frei Admin - Owner Palm & Tree Services in Brisbane Join Date: Jan 2007 Location: Brisbane Posts: 12,990	Re: Chestnut Problem Sounds bad, got a lot of people stumped. What about weather, has it been peculiar for say the last 2 to 3 years? Nothing works on it, all fungicides fail, maybe if you guys can have a few in different locations try some different techniques. Over here our usual tough as nails mango trees have been looking pretty ordinary, seems the tips affected by fungal problems. I tried phosphite and I tried macozeb, the fungus is anthracnose. Now the instructions said phosphite wont work on anthracnose but that mango tree did better than the one I used macozeb on. But there exists another problem hard to control, possums eating off the juvenile foliage keeping the tree defoliated, then pests move in. So I treated with confidor, got rid of the bugs but the possums were still a problem. I found this interesting article, in this article you can see it wiped the indigenous tree population out and a new resistant species is being introduced. ScienceDaily: Chestnut Trees To Spread Across Landscape Again, Says Purdue Scientist __________________ Protect your rights to work - Join Australian Tree Association My businesses:- Qualified Brisbane Palm and Tree Lopping \| Stump Grinding Brisbane \| Brisbane - Gold Coast Consulting Arborist

7th September 2007, 08:20 AM	#17
dogweed I'm new here so be nice Join Date: Sep 2007 Location: UK Posts: 3	Re: Chestnut Problem By benefiting the pathogen more than it benefits the tree.

7th September 2007, 02:51 PM	#19
Eric Frei Admin - Owner Palm & Tree Services in Brisbane Join Date: Jan 2007 Location: Brisbane Posts: 12,990	Re: Chestnut Problem Fungi is a bugger to kill. I did a whole load of hunting around and an old school method was peroxide and bleach. __________________ Protect your rights to work - Join Australian Tree Association My businesses:- Qualified Brisbane Palm and Tree Lopping \| Stump Grinding Brisbane \| Brisbane - Gold Coast Consulting Arborist

7th September 2007, 06:12 PM	#20
dogweed I'm new here so be nice Join Date: Sep 2007 Location: UK Posts: 3	Re: Chestnut Problem Pseudomonas syringae, which has now been identified as the pathogen behind the canker problems in northern Europe, is a bacteria, not a fungus.

3rd April 2008, 10:51 PM	#21
Eric Frei Admin - Owner Palm & Tree Services in Brisbane Join Date: Jan 2007 Location: Brisbane Posts: 12,990	Re: Chestnut Problem Bump from this thread back to here. http://www.treeworld.info/f2/new-dis...nuts-2021.html __________________ Protect your rights to work - Join Australian Tree Association My businesses:- Qualified Brisbane Palm and Tree Lopping \| Stump Grinding Brisbane \| Brisbane - Gold Coast Consulting Arborist

4th April 2008, 07:17 AM	#22
TreeSpecialist Mature tree Join Date: Mar 2008 Location: Austin, Texas Posts: 373	Re: Chestnut Problem Fungi (most all types) can and do overwhelm other pathogens - primarily bacteria and weaker, though often fatal, fungal species. They are part of the overall pattern of tree death and decomposition. Since this article now identifies a bacteria, could this not have been the problem all along? Millions of conker trees face being wiped out by deadly new disease \| the Daily Mail And to treat bacterial infections, one would use antibiotics. Wonder if anyone has tried that approach? __________________ Last edited by Eric Frei; 4th April 2008 at 08:22 AM. Reason: added link

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