I once took over the looking after a garden with a mature yew hedge ( 15 years old ) which was full of bindweed. With very careful use of Roundup I killed it without harming the yew in any way.It took me two years, but I got there. I wonder how the "no chemical" brigade would have dealt with it.
I started working in a GC in 1979 when everyone sprayed roses weekly with insecticide and fungicide. I've not used either in over 25 years, but sometimes you either bang your head against a wall or use chemicals sparingly and correctly.
Id speak with the neighbour first, see if they can put a barrier in the ground to prevent roots coming into your property. Maybe even offer to help them do this?
If they refuse, and don't seem to care about you and your problem then I'd dig a deep trench in your boarder along the fence line so you can see any roots growing through, and cut them.
If after a year or two the problem persists then I'd still consider poisoning the roots on your side of the garden boundary. Enough time will have passed to disassociate you from the death of your neighbours plant.
If the neighbours plant dies then tough luck on them for not taking steps to prevent the problem. But speaking to your neighbours should be the first step.
I doubt it could ever be proved. It's not as though BEL has climbed over the fence and poisoned the neighbours plant. All BEL would be doing is poisoning the roots that grow on his/her property. It would at most become a civil matter of a boundary dispute, not a police matter. If BEL does what I suggested above then BEL could show he/she has taken all reasonable steps to resolve the problem first.
But as I posted above, speak to the neighbour first.
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If your neighbour is inconsiderate enough not to do anything about it, then id certainly apply some chemicals to the bamboo.
I bet Roundup or similar would work if you cut into the root and applied directly.
I once took over the looking after a garden with a mature yew hedge ( 15 years old ) which was full of bindweed. With very careful use of Roundup I killed it without harming the yew in any way.It took me two years, but I got there. I wonder how the "no chemical" brigade would have dealt with it.
I started working in a GC in 1979 when everyone sprayed roses weekly with insecticide and fungicide. I've not used either in over 25 years, but sometimes you either bang your head against a wall or use chemicals sparingly and correctly.
BEL, a word of caution. If you apply weedkiller to your side , and it damages the plant on his side, you might be in trouble.
If they refuse, and don't seem to care about you and your problem then I'd dig a deep trench in your boarder along the fence line so you can see any roots growing through, and cut them.
If after a year or two the problem persists then I'd still consider poisoning the roots on your side of the garden boundary. Enough time will have passed to disassociate you from the death of your neighbours plant.
If the neighbours plant dies then tough luck on them for not taking steps to prevent the problem. But speaking to your neighbours should be the first step.
I'm not sure the law would see it that way. It might be considered " causing actual criminal damage"
But as I posted above, speak to the neighbour first.