We have an Australian Grass tree which has been infested with what appears to be scale. The tree is in its original pot when purchased and then that placed in a larger pot and elevated allowing for plenty of drainage from both pots.
Scale pests are common on Grass Trees. Spray with Yates Nature's Way Citrus & Ornamental Spray at least once a week until the last sign of the pest has gone. Some of the dead Scales may still remain on the plant, these can just be wiped off with a rag.
Feeding your Grass Tree with Yates Dynamic Lifter Liquid Concentrate will also help with pest and disease resistance and resiliency.
Answered: 13 Feb, 2022