Hi plumeria people
So I have been bit by the plumeria bug and I gave one established plant which bloomed this summer as well as several cuttings which are either fully rooted and have several sets of leaves, or are starting to produce new leaves. Since I live in Santa Cruz, I've brought them inside where they get a few hours of partial sun through the window in the morning. They are all still growing but one cutting Started having its leaves curled down and it moved to a second cutting doing the same thing. It looked to me like they had pest damage on the bottom side of the leaves. So I sprayed them with an insecticide but now they only look worse. The leaves have started discoloring and yellowing further on one cutting but on also on that same cutting and the others I sprayed, the leaves are turning black In spots and are dying. Please help me save my cuttings/plants. Any thoughts/comments/suggestions are greatly appreciated 💚🌵🌱

What pesticide did you use?
Plumeria will go dormant if the light isn't good enough. They rest all winter and will come alive in Spring. You reduce watering at this time. Keep watching, and give it the best light you can manage.

I grow mine outside and in a greenhouse. This is the time of year is where they get attacked by scale and mealy bug, and also the time where they naturally start discarding leaves in preparation for going dormant. Its not anything you can control or prevent...plumeria go dormant in the days of less light and less water even in their native habitats. Let the leaves that are going down go down, pull them off when they let go, and keep what remains. Its a natural process. Im my greenhouse, I let them just drop leaves as they wish, UNLESS I see active insect infestation. Then I cut those leaves off, because treating them with pesticide at this time of year is worthless, the leaves will eventually fall off when dormancy starts anyway.
The plants I have planted in the ground outside the greenhouse just fend for themselves. There are natural predators to take care of pests. If the leaves fall off, that's ok.
I have a tray and a half of new seedlings that I started from seeds I collected from some plants last May at the beach that are about 8-10 inches tall, they are also dropping leaves . But its no worries, I have grown plumeria since the late 1980's when I lived in Los Angeles before I moved to Florida and I know by now its just part of the natural cycle of this plant

I agree and the only advice I would add is if you are not already picking up and disposing of the leaves that have fallen please do so. If there are any pests lurking you do not want to house them during the dormant period. Just normal plant housekeeping.

I have not checked but I bet we have a forum dedicated just to Plumeria here. Look over the list of individual forums, you might want to read some of those posts.