I LIVE IN DEEP EAST TEXAS I HAVE 3 SAGO PALMS PROBABLY 7 YEARS OLD, AFTER WE HAD A 2-3 DAY FEEZE I NOTICED THEY WERE TURNING YELLOW AND THE CLOSER I LOOKED I SAW MOLD AND THE TRUCK HAS SAP LOOKING STUFF COMING OUT IN SPOTS.
SAGO PALM OOZING
Certified GKH Gardening Expert
It would be impossible to remove the moldy part without killing the sago palm, so applying a fungicide now is probably the best option. Copper-based fungicides are recommended as described in the following article. The article is about true palms, not sago palms, but I think the same advice applies because of their similar growing habits: