Bougainvillea disease

Javea, Spain(Zone 10a)

Some of many many bougainvilleas have not produced any buds or leaves on some branches, when I cut into a branch there is a distinct yellow fluid just under the bark. This is quite obvious from the following photo. Can anyone identify the problem and how to deal with it? I live in Spain in an area equivalent to zone 10a where bougainvilleas grow profusely.
Many thanks

Thumbnail by ikebana67
new south wales, Australia

I had the same problem a few years ago, someone has poisoned the plant.
I just cut mine back and it is still growing.

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