Mandevilla plant

Question

I have moved it indoors and am seeing clumps of white at the base of leaves and on the stems. What is it, and what should I spray or do? Should I cut back, as plant is losing most of its leaves?

Answer 1

This could be a mealybug infestation, or one of the other white insects listed here:
https://www.gardeningknowhow.com/ornamental/vines/mandevilla/mandevilla-pest-problems.htm

If it's mealybugs,you'll be able to see the bugs if you look closely. Please see these articles for information and treatment options:
https://www.gardeningknowhow.com/plant-problems/pests/insects/mealybugs-control.htm
https://www.ipm.iastate.edu/ipm/hortnews/2004/2-27-2004/mealybugs.html

As for the lost leaves, just make sure not to overwater the plants, since they'll use less water.