Re: What makes holes in walnut trees?

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bp@www.zefox.net hat geschrieben:

David E. Ross <nobody@nowhere.invalid> wrote:

On 7/10/2025 10:48 PM, Michael Uplawski wrote:

Anyway. No chemical product exists which could act against an
ongoing infestation. Usually you have to get rid of the beetle.

There are actually two chemical methods of eliminating borers in trees.

I may have been quick with my writing. When I write “ongoing
infestation” I am influenced by my work in an orchard of about 7ha –
whatever that is in imperial; let's say a big orchard of fruit
trees. “A tree” does not motivate the same reaction. But thank you
for the information.

I tried probing the holes with a wire, it went in, seemingly straight,
about 9 or 10 millimeters and stopped firmly. If there was an egg at
the bottom, now it's an omelete 8-) I'll certainly keep an eye out for
more damage.

Rather a grub than an egg, but this may be efficient. It is however
best to know your enemy. There are borers („drilling equipment” in
German, darned false friends), which do not harm the tree and some
are quite useful animals, when they are otherwise occupied.

… the usual remedy is cultural: Keep
trees healthy, remove damaged wood and sterilize the debris. The bugs are
here to stay amd a chemical warfare stalemate isn't very attractive, at
least not for an ornamental tree.

I do not know. If one tree is precious to me, I might try just
anything. Walnuts are terrific.

Cheerio

Michael
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