Caryota leaf spotting

[John in Andalucia]

I believe this rust spotting occurs on Caryota ophiopellis and zebrina often, but I don't know what it is, or how to prevent it. Does anyone have any advice? This is one of 6 Caryota ophiopellis plants of mine, and most of them have it to some degree.

[Tyrone]

There are some leaf fungi that jump from leaf to leaf by touching other leaves that are infected. Maybe it's that.

Best regards

Tyrone

[John in Andalucia]

There are some leaf fungi that jump from leaf to leaf by touching other leaves that are infected. Maybe it's that.

Best regards

Tyrone

Thanks, Tyrone. These Caryota leaves are quite sensitive, they nearly all succumbed to the same spotting at the beginning of Autumn. I've applied copper fungicide, but I'm not too concerned, as long as it doesn't infect my other palm seedlings.

[John in Andalucia]

I found some clues, namely a bacterial blight. From looking at the reference, it appears a lot more serious than the blight affecting my leaves. This blight Pseudomonas avenae also runs along the leaf veins, which isn't apparent on mine.

Some reference:

Bacterial leaf blight (Acidovorax avenae, syn. Pseudomonas avenae): (See first on list)

BACTERIAL BLIGHT OF FISHTAIL PALM CAUSED BY PSEUDOMONAS AVENAE

pp355.pdf