Plumeria

Question

The new leaves coming are deformed in shape. What could be the problem?

Answer 1

Often deformed leaves can indicate a pest issue.

Inspect the leaves for signs of pests.

Neem Oil is a good treatment and also works as a fungicide.
Plumeria can often be effected with Rust fungus also.

Here are some links with more information.

https://www.gardeningknowhow.com/ornamental/flowers/plumeria/growing-plumeria.htm
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm