Q.What’s Wrong With My Ponytail “palm”?
Our ponytail was bought from a local garden store (Palm Desert CA) and immediately planted in our garden (Palm Springs CA) in full sun from 11 a.m. to 4 p.m. It did well for a year. Now it showed a bright yellowing at the top shock, and these leaves pull out with ease. The two or three minor sprouts a the lower trunk seem fine so far. Our gardener says it has an insect infestation that can’t be treated with Neem or other chemicals.
Certified GKH Gardening Expert
Unfortunately, your photo did not come through. I am unable to see the damage. It could be an insect infestation, but it could be lack of light, nutrient deficiency, disease, or other environmental factors. It will depend on how it presents itself. Without photos, I cannot say which factor it could be.
In the meantime, this article will help you to know what kind of care that they require:
https://www.gardeningknowhow.com/houseplants/ponytail-palm/ponytail-palm-care.htm