caterpillar cocoons in timber - ID please?

[richardbees]

I've just found this row of cocoons 'glueing' two scaffold planks together used for flooring in my greenhouse. There was a wooden box on top which was also stuck down - I had to use a spade to prize the box off the floor and the planks apart. There's a 6" cavity between the planks and the soil with loads of gaps to the outside.

The caterpillars are sulphur yellow and fast wrigglers! that red thing is 2ft long bolt cutter

[triops]

Check out thge Bee Moth, Aphomia sociella, either on WAB or Google, and you might find an ID.

[richardbees]

triops,

It's highly likely that you are spot on - as there are two separate 'buff tailed' bumble bee colonies in mouse holes underneath that same decked area and also twenty year's of beekeeping wax detritus that must have fallen through the planks!

Thank you - and I apologise for not being able to manage to post the photo.....it is in the image Gallery under my username.

Richard