Sudden oak death in The Netherlands

[AA Teccie (Paul)]

Haha, thanks Paul. Henry and I go way back. He was my mate while working at Copijn back in 1986. We never lost contact. That can't really happen in The Netherlands with our close friends arborist community. 😉

 

Wolter

 

"Old friends"...but not yet sat on their park bench like bookends (an old Paul Simon song, how sad eh!)

 

Cheers Wolter, hope you get a definitive which will doubtless involve some level of lab analysis.

 

Paul

[Treespotter]

Yup Paul, been there, done that.

Not all questions need to be answered. Some are vented to trigger communication. 😉

 

Wolter

[treeseer]

Wolter, your pictures show trees with turf to the trunks, and the flares covered. Stem tissue is in the flare down to the root collar, where roots separate. So there is Positively a soil-trunk connection. Glad to hear that the soil drains well, but its presence on stem tissue is still a problem.

jomoco is recommending the same trunk drench material that I was. Standard practice is to clear the dirt off the flare before drenching.

[john k]

It's very unlikely to be Sudden Oak Death (Phytophthora ramorum). The common name came from the USA where various types of oak were affected, but the main European species Quercus robur and Q petraea are not susceptible.

 

It looks like it could be Acute Oak Decline though, which is still bad news. Is there evidence of D shaped exit holes where beetles have emerged (about 6-8mm across)?

 

More details on the Forest Research web site here:

 

http://www.forestry.gov.uk/fr/acuteoakdecline

[treeseer]

AOD seems to be an acronym in search of a disease agent. The treatments for both AOD and SOD are the same.

[Treespotter]

Wolter, your pictures show trees with turf to the trunks, and the flares covered. Stem tissue is in the flare down to the root collar, where roots separate. So there is Positively a soil-trunk connection. Glad to hear that the soil drains well, but its presence on stem tissue is still a problem.

jomoco is recommending the same trunk drench material that I was. Standard practice is to clear the dirt off the flare before drenching.

Ah, check. Now I understand what you mean with 'dirt on the trunk'.

I'll check on Monday if the bark is covered up.

 

 

Wolter

[Treespotter]

It looks like it could be Acute Oak Decline though, which is still bad news. Is there evidence of D shaped exit holes where beetles have emerged (about 6-8mm across)?

 

More details on the Forest Research web site here:

 

http://www.forestry.gov.uk/fr/acuteoakdecline

 

Didn't notice any holes. Will check for them on monday.

 

Wolter

[treeseer]

Have the beetles found to be a cause or a vector? I did not see that in the FS writeup.

[john k]

There seems to be a definite association between the beetles and the disease, but as far as I'm aware that's as much as anyone knows at the moment.

[Treespotter]

Couldn't find the holes. I have to use a brush and water to remove the black hardened ooze.

 

Wolter