yellow spotting on Cordyline?

Ive attached some photos, the leaves on the Cordyline are spreading to new leaves pretty fast, but there's nothing much I can do at this current time. The leaf tips are yellow but I think that is fairly normal, what isn't normal is these yellow spots, I haven't had the plant all that long, maybe 5 months.. but recently I spotted leaves on the lower plant with yellow spots, these leaves died off, I thought this was just a natural thing, so left it.. however now the spots have spread to the newer leaves and is becoming fairly widespread.. Is it likely the plant has had it?

 

I've never known it to kill a plant Stephen, but it does spoil them.

Not found out the cause, but most of mine have always shown this spotting, its worse in winter, new foliage in summer is usually ok.

 

That's a relief to know Pete, the soil it's in is obviously sopping wet from the disastrously wet year weve had, but there is no standing water. Therefore if this is what happened with yours, it could be climatic?

 

Climatic possibly, I tend to think fungal, or dare I say it bacterial, viral.

Whatever, once they reach 20ft you dont tend to notice it.

 

I think it's time to remove the dead Autumn leaves out of the crown yes from a distance it's not noticeable, but if it doesn't kill it I'll get something to treat potential fungus/bacteria come spring.