White Spots on Cold Hardy Palm

Question

My cold hardy palm has white and rust spots. Some of the palms are starting to die. I have been treating it with a fungus and rust spray and it is not working. Do you have any suggestions with this problem?

Answer 1

It is likely palm scale. Neem oil is a good treatment. These articles should help: https://www.gardeningknowhow.com/plant-problems/pests/scale-bug-how-to-control-plant-scale.htm, https://www.gardeningknowhow.com/houseplants/palms/sticky-palm-tree-leaves-treatment-for-palm-scale.htm, https://www.gardeningknowhow.com/ornamental/trees/sago-palm/white-spots-on-sago.htm (treatment would apply to your palm as well)