Q.Foxtail palm
There is a brown jelly like substance in areas near the base of one trunk of a triple foxtail palm. What is this and how to treat if need be?
This is of concern and should be looked at by a professional Palm Arborist.
The links below may have some information for you on possible diseases.
https://www.naturepest.com/professional-do-it-yourself-pest-control-advice/foxtail-palm-wodyetia-bifurcata-pests-diseases-deficiencies/
http://abovecapricorn.blogspot.com/2009/10/rotten-falling-palms.html
You can also contact your County Extension Office for local help on palms and possible diseases.
https://www.gardeningknowhow.com/extension-search/