My plumerias been out all summer, what's the best pesticide to spray on them before I put them to sleep for the winter?.
Are you having pest issues or just wanting to prevent them?
Once the leaves drop or you remove them there really isnt much for pests to mess with. If you do get some, treating is easy without leaves.
Mine will go in the greenhouse and I plan to spray all my plants with neem every few days prior to them coming in. Ill still get spider mites but Neem knocks em down pretty quick.
I trim all leaves, spray with Bayer 3n1. Let them sit for a day then move them in the house.
Right now I use Neem oil. Mostly because I have a bottle of concentrate and a pump sprayer to make short work of it. But I have used both at various points with good results. Also used a granular treatment for ants in conjunction with them.