Chalara fraxinea - Generic thread

[Paul Cleaver]

On ‎22‎/‎06‎/‎2019 at 13:47, EdwardC said:

 

 

 

 

On an even gloomier note, Chalara does infect, and has been found on, other members of the Oleaceae family. On a more positive note, it doesn't appear to infect olives.

I did not know this. Out of genus list I recognise,  I see Lilac, Privet, Jasmin, Osmanthus, Phillyrea and Forsythia.

Worth looking out for symptoms on these shrubs too.

 

[The avantgardener]

14 hours ago, Pete Mctree said:

How many of these trees that are recovering, are coming back from drought induced stress and not Chalara?

Last year we had a long hot summer in the South East, It was the first hot summer that lasted any length of time in years, 2018 had hot spells here but it is normal in Summer, before that 76,  as there been extensive annual droughts in other parts of the country that I am unaware of recently?

The Ash I took down recently was mixed with a Beech crop, Beech tends to suffer more from drought conditions than Ash, the Beech is fine , the Ash is f**ked, it’s been declining on this site for years and certainly isn’t coming back.

Edited August 17, 2019 by The avantgardener

[devon TWiG]

I looked up about ADB in Europe to see if there has been any success in growing seedlings from the "resistant " trees and it seems success is very limited ...

 

[The avantgardener]

2 hours ago, devon TWiG said:

I looked up about ADB in Europe to see if there has been any success in growing seedlings from the "resistant " trees and it seems success is very limited ...

 

I planted lots of different Ash from all over the world as an experiment at Bedgebury Pinetum 5 years ago, all look great so far but not holding my breath, it has already been confirmed in other host species of the Oleaceae family.

Edited August 17, 2019 by The avantgardener

[Pete Mctree]

8 hours ago, The avantgardener said:

Last year we had a long hot summer in the South East, It was the first hot summer that lasted any length of time in years, 2018 had hot spells here but it is normal in Summer, before that 76,  as there been extensive annual droughts in other parts of the country that I am unaware of recently?

The Ash I took down recently was mixed with a Beech crop, Beech tends to suffer more from drought conditions than Ash, the Beech is fine , the Ash is f**ked, it’s been declining on this site for years and certainly isn’t coming back.

Sorry, but I don’t get your answer to my post - a lot of ash trees are knackered here too - some from the drought last year - others from charalia - people were saying that some trees were “recovering” and I queried what from.

[Peasgood]

10 hours ago, The avantgardener said:

as there been extensive annual droughts in other parts of the country that I am unaware of recently?

In my part of Cheshire there certainly has and extends down through Shropshire as far as South Wales some years. 

Last year was extreme. I had an acre of well established apple trees that were wilted most of the year, I’ve never seen apples actually wilt before.

 

The EA publish records from throughout the country of ground water levels on an annual basis, they confirm the above. 

No drought here this year!

[Adam M]

On 22/06/2019 at 13:47, EdwardC said:

On a more positive note, it doesn't appear to infect olives.

That's not a positive note. Olives are akin to engorged ticks and should be incinerated for biosecurity reasons. I have no doubt that Xylella fastidosa was knocked up by someone who knew what they were doing, for the greater public benefit ? 

[Stubby]

16 hours ago, Adam M said:

That's not a positive note. Olives are akin to engorged ticks and should be incinerated for biosecurity reasons. I have no doubt that Xylella fastidosa was knocked up by someone who knew what they were doing, for the greater public benefit ? 

Heathen ! ?

[Arborowen]

This may not be the precise best place to post this. However I've spotted an Ash nearby to my home that is exhibiting some significant foliage stress. I've taken a sample and it does not seem to be emenating from the leaf veins as per ADB rather from the leaf margin. 

I'm interested in what this could be for obvious reasons. The tree stands imediatley next to another which is not showing these signs of foliage stress. 

My next thought was verticillium wilt but it doesnt appear to match images I can see from a quick Google. 

All thoughts and theories welcomed. 

O

[jonnygurkha]

Yesterday I had to fell a reasonable sized Ash tree that was showing advanced signs of ADB. I had heard that the disease shortens the wood fibres and makes them weaker. When I looked at the hinge I would normally expect on a healthy Ash to see menacing looking pointy needles of fibre sticking up but on this one the fibres were indeed shorter and blunter. I certainly wouldn’t want to fell one with a significant lean in the wrong direction.