Managing clumping bamboo

We have recently cut back a very large area of bamboo. approx 6mtrs x 1.5mtrs. There is some area of adjacent bamboo we have left and wish to retain.
After initially cutting down the bamboo, it was chopped up with stump grinder, roots raked up as best as possible.
Over this area, we laid down a weed mat, and we have now built a new timber deck, elevated above the ground line approx 60cm.
To our horror, we just noticed some new shoots growing below the deck!
Do you have any natural suggestions for killing the bamboo where we do not want it but keeping it where we do?
Would sugar work?
many thanks
Patricia

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1 Comment To "Managing clumping bamboo"

#1 Comment By GKH_Susan On 01/23/2020 @ 4:00 pm

Chopping up with stump grinder just created more starts. You have to get out every piece. Now it's either mechanical removal (digging it out. 60 cm, that's crawl space) or repeated herbicide applications until there is no more sprouting. You can also douse the seedlings with boiling water. Sugar will not be effective in this case.

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