Read the attached link. It has lots of good info. The only use I know of for Epsom salts is to green up leaves and promote flowers. Have you tried SuperThrive? I think it is good stuff.

Here is a link that might be useful: Cycad Scale

tsmith, thank you for the information. My husband bought some oil yesterday and I sprayed the entire sago. I also went to a nursery that I frequent with one of the infected leaves. She told me to spray about every week or so and when we are through with frost/winter, in mid-March or so, I can prune off some of the leaves. I hope we can save it by doing all of these things. Thanks again for your response.

Update and question on my problem sago.....after spraying the leaves several times, I removed the most diseased ones by clipping them (the local nursery advised to do so, after all threat of freezing temps were gone.) A whole new crown of shoots are coming out (Pardon my ignorance, not sure what the term is.) I thought we were on the road to sago recovery when I noticed this morning that there are globs of gel-like substance on each stem where I cut the fronds. What is that all about? We have had at least three days of continuous rain and thunderstorms, but would that be a reason? Is this a good thing or a bad thing?

I appreciate any response. Thanks!