Q.Scale on Sago Palms
I have been treating my sagos for scale, with a oil base treatment. Is there anything new out?
Certified GKH Gardening Expert
Scales normally infest the lower side of fronds before moving upward. Prune off all the infested fronds and dispose of them. Treat with horticultural oil, available at most garden stores. Apply the oil to the fronds and insects, making sure to get the undersides of the fronds as well. You may need to reapply weekly for up to five weeks. You can also try neem oil. It is organic and harmless to humans and pets but still kills scale very well.
Here is more information: https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm