Sick Triangle Palm

[BrettCee]

We have just returned from a long holiday to find one of our Triangle palms is quite unwell
Where normally new growth from palms comes from a spike from the centre of the plant, ours has produced some new leaves out to the side of the plant.
Many of the old branches we quite dead looking so we cut them off

We now think we may have an answer to why the plant is so sick. Last year our neighbours passionfruit vine grew out of control and we asked him if he would mind keeping it smaller .
Looks like he has used roundup on the passionfruit and some has gone onto our palm.
Is the condition of our palm similar to how a poisoned plant would normally look and if so are there measures we can take to help save this palm?

[Bruzzybill]

Could be that but check no small mites or insects are
Having a suck on the new spears as they are just beginning
This would also stunt new shoots