Hey Casie,
thanks for your comment and link in your reply.
I considered borax, but, like Paul said in this threat: it is toxic. And the bamboo rolls are in the sleeping/living/ dining/ kitchen area. (well.. at least we have the bath tub in a different room)
With a nosy 8month old puppy, borax isn't the best solution I'm affraid. My second thought is that my idea for using hot steam will bend the split bamboo wood and will damage it also, but in a different way than de woodbeetles are doing already.
Yesterday the manager of the gardencentre (where I bought the bamboo) contacted me,
he would like to take back the Bad Bamboo roll and is willing to give me my money back AND a 50 euro coupon for the dissapointment. That is so nice!
I will give him the advice to treat the bamboo like its at a high risk for his other wood containing products, but I think he sure will see and even hearing the woodbeetles bugging around.
So today I did some reverse engineering with the structure, and apparently it was even worst than I thought. The woodbeetles had some feast inside the bamboo, so I think it is not bad at all that I took it away before they run out of old wood and started on my other structures.
Next thing I did was putting on some sticky paper tape that painters (some of them) use and put it backwards on the remaning poles, so they might get stuck when they are wonder around.
I also taped some of the holes that aren made from the screws we used to put the whole thing together, to visualize if there is still any action from remaining beetles.
Well.. it is time for me to re-think my other options for a low budget, sustainable, rental house proof -and bug free- room devider.
oh, my bad. I've made some very high quality videos of my efforts today, the bugs are kind of cute- so hopefully people can have a good laugh out of this one:)
https://vimeo.com/146311012