Glyphosate poisoning and fracture pruned oak.

[Graham]

Some clearance was done around a sheduled ancient monument about three years ago and evidently the stumps were treated with neat glyphosate. The dieback of this oak coincided with that. Can one assume that, from root grafts, the poison was translocated?

 

The dead top was extremely brittle but the lower crown had responded with epicormic shoots and strangely shaped leaves. The 'town park' mentality suggested felling but working with the ranger service we opted to fracture prune. Only time will tell.

 

 

 

 

 

 

[Graham]

And why after editing pics do they still load sideways!

[daveindales]

Iv'e mentioned the dangers of using glyphosate as a root treatment in a previous post. It works well, but can translocate to adjacent trees of the same species. It's happened to me once before. Not sure about different species.

[Tom Joye]

Different species will normally not root graft, but if some of the treated stumps were oak, translocation of glyfosate through root grafts is perfectly assumable.

[Graham]

Yes I'd assumed that the clearance must have comprised some oak but the info came to me via a third party.

[Fungus]

Some clearance was done around a sheduled ancient monument about three years ago and evidently the stumps were treated with neat glyphosate.The dieback of this oak coincided with that. Can one assume that, from root grafts, the poison was translocated?

The dead top was extremely brittle but the lower crown had responded with epicormic shoots and strangely shaped leaves.

 

Graham,

There needs to be no contact by root grafts to translocate the round up, connections with shared mycelia (or rhizomorphs) of ectomycorrhizal symbionts (or Armillaria) will be sufficient to reach the roots.

And the yellow fungus is Stereum hirsutum, a saprotrophic pionier decomposing already dead cambium and throwing the bark afterwards.

[arbwork]

I also have experience of glyphosate affecting trees adjacent to treated stumps moved over to using triclopyr

[Graham]

Graham,

There needs to be no contact by root grafts to translocate the round up, connections with shared mycelia (or rhizomorphs) of ectomycorrhizal symbionts (or Armillaria) will be sufficient to reach the roots.

And the yellow fungus is Stereum hirsutum, a saprotrophic pionier decomposing already dead cambium and throwing the bark afterwards.

 

This is the first time I've, knowingly, observed roundup damage like this. Thank you. I had expected a physical contact/union necessary between the trees.