Phytophthora????

[Woodreeve]

Can anyone help or has anyone seen these bark patterns before? Sweet chestnut coppice in Kent. I've seen P.cambivora and chestnut blight before but I've never seen these concentric patterns. Any ideas? Cheers.

[daltontrees]

I've seen this referred to on Walnut as the result of canker caused by Nectria galligena (Pirones Tree Maintenance). But I'd like to hear if someone has something more definite for Castanea.

[David Humphries]

Wouldn't rule out Phytophthora sp (perhaps get a testing kit)

 

But I wonder whether these may be some sort of target canker?

 

They appear mostly to be circular and around old branch/twig collars.

 

 

 

.

[treeseer]

Cool looking patterns.

 

On the south side of the stem?

[Jon Heuch]

I suggest you log them on the Tree Alert website. There are a number of things affecting sweet chestnut and being in Kent it's close to the continent. You will need to reduce the file size of the photos to log it .

[Woodreeve]

Have logged it and they have requested samples as they aren't sure either. Will update as and when I hear anything.

[Paul Cleaver]

Wouldn't rule out Phytophthora sp (perhaps get a testing kit)

 

But I wonder whether these may be some sort of target canker?

 

They appear mostly to be circular and around old branch/twig collars.

 

 

 

.

 

looks like target canker to me