Palm decease or nutrient deficiency problem?

[paquicuba]

I need help please identifying what's wrong with the palm in the attached images. I have no idea which variety it's, it was giving to me by a friend as a fast growing palm to form a quick canopy. I have three of them planted in a row. Ironically, the one that is growing the fastest, is the only one showing signs (not all the time) of a strange decease or nutrient deficiency. I have used foliar sprays and granular micro-elements along with palm fertilizer and I have also stopped fertilizing it for a while with no luck, the same symptoms keep coming back on random fronds . 

The fronds grow green and "healthy" but all of a sudden some leaflets turn brown (1st image) and later look like in the 2nd image. The 3rd image shows one of the fronds that haven't been  affected at all. 

Thanks a lot for your expert response!

 

[paquicuba]

Anyone? 

[Neil C]

Almost looks like sunburn. Could the fastest growing one have grown above any shade and getting burnt?

Regards Neil

[Rickybobby]

Adonidia ? Mine did the same thing looks the same. Got burned 

[Tingtongthai]

sunburn and wind combined, get the same here sometimes on them, they grow out of it or adapt  better later

[paquicuba]

Thanks guys! I guess it'll have to adapt 'cause there is nothing on top of it to protect it from the sun. 

Edited July 17, 2018 by paquicuba

[paquicuba]

Newest frond that opened up over a week ago didn't get any sunburn even though our current daily temps here are reaching the mid 90s. I'm still puzzled  as to why some fronds are green and healthy and others just burn. And no, this palm cannot be an Adonidia, it's already taller than most mature Adonidias.