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Trunk Boring Grub?
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Author:  1ggy [ 10 Aug 2024, 10:51 ]
Post subject:  Trunk Boring Grub?

Hello,
Noticed a shed skin hanging out of a hole in me Beech bonsai. Stuck a wire in the hole and it goes up about 10cm. What is it and what to do?
Has he gone now? Do I plug up the hole?
Any advice please guys?

Author:  daryl [ 13 Aug 2024, 17:33 ]
Post subject:  Re: Trunk Boring Grub?

It’s hard to answer but my guess would be that if you saw a shed skin that could be the case of the pupa and the creature has now emerged and flown away. Can you post any photos? Use imgbb - it’s the easiest way.
How big is the hole? Eggs are generally laid via a tiny hole and the creature comes out via a bigger one.

Author:  1ggy [ 13 Aug 2024, 20:56 ]
Post subject:  Re: Trunk Boring Grub?

Attachment:
331D5F1D-D827-4FC8-8420-7D429D09CABB.jpeg
Attachment:
44E07B41-C9E7-4020-85E3-C862D5CA479F.jpeg


Hello Daryl,
Many thanks for reply. Photos attached.

Author:  daryl [ 13 Aug 2024, 21:16 ]
Post subject:  Re: Trunk Boring Grub?

:suro:

Author:  daryl [ 13 Aug 2024, 21:17 ]
Post subject:  Re: Trunk Boring Grub?

Gosh! That looks big! Have you tried doing an image search on the larva case?

Author:  Paul B [Swindon] [ 13 Aug 2024, 22:56 ]
Post subject:  Re: Trunk Boring Grub?

Good old google says it's a 'Goat Moth',

Quote...........
The Goat Moth Caterpillar is one of our largest and impressive species.
They use a wide variety of habitats and foodplants such as alder, ash, birches and willows. The eggs are laid on a tree and the larvae burrow into the main trunk or branches.
The Caterpillar can take 3 to 4 years to complete its growth living under the bark feeding on living wood.
When fully fed it may spin a cocoon or leave the tree to look for a pupation site, either in rotten wood or underground. It overwinters for the final time in a strong cocoon before becoming an adult moth the following spring.

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