I have a sago palm 3y/o. I am in AR so it is brought inside every winter and put out in spring. This season, I just put it outside 2 weeks ago. I noticed a large amount of white specks all over the base and on the underside of the leaves. Last year, I had the same thing and I sprayed it with an organic miteacide but, it caused the outer leaves to yellow. The greenhouse guy told me it was the miteacide which causes this. This yr I took a power sprayer to it (not a huge one, a small hand held one) and all the white specks are gone. But now, ALL of the leaves are browning again!! Worse than last time. THE ENTIRE PLANT. Could this be caused from moving it outside, needing food, the power sprayer... HELP!! http://i27.photobucket.com/albums/c198/turtlegirl01/001-1.jpg

The best person to answer this is a Nurseryman who can actually touch and see the damage, the white specks.

The leaves could be brown because they were damaged by the mites.

It may be Whitefly.
I have heard Soapy water to work.
Whitefly - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Whitefly)

Mine get like that if they get too much sun, almost scorched.