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A few pics from today's job


Tnarg25
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it is caused by an elm bark beetle which carries a fungus i think !!! when i first started in tree work any dutch elm timber was removed and supposedly burnt but now they reckon that the beetles are long gone and onto their next victims by the time the tree is dead !!

yes the clear up was awful i stayed up the the tree as long as possible lol !!

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Scolotyd beetle, scolytus scolytus lays eggs under the bark, (as soon as the bark gets rough enough for the beetle to take hold, coinciding with a height of tree of about 20-ish feet), and introduces a microfungus [usually] ophiostoma novo-ulmi. The tree then closes the xylem vessels in an attempt to contain the spread of the fungus, thus strangling itself.

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Scolotyd beetle, scolytus scolytus lays eggs under the bark, (as soon as the bark gets rough enough for the beetle to take hold, coinciding with a height of tree of about 20-ish feet), and introduces a microfungus [usually] ophiostoma novo-ulmi. The tree then closes the xylem vessels in an attempt to contain the spread of the fungus, thus strangling itself.

 

I recon its down to cambium thickness not bark roughness.

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The relevance of the bark roughness is a theory of why the trees dont get hit for about 15-20 years. It could well be cambium, it could also be that the beetles apparently have a flight height of about 4-5 metres I have also read, and that until the tree reaches this height, which coincides with the bark losing its smoothness, it is not susceptible to the beetle.

I think that there is probably a certain amount of indecision about the causes......

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