
Spider mite.

Mealybug and nest.
Spider mites and mealybugs tend to plague mirlitons that are planted in containers, especially if kept indoors as you overwinter the plant. You can manage mealybugs by soaking a cotton swab with 70% isopropyl rubbing alcohol and dabbing it directly on the bugs. Or you can dilute the alcohol with water at a 1:10 ratio (one part alcohol, 10 parts water) and spray it on the leaves, top and bottom.
Mites can be controlled with the same alcohol spray or with neem oil or insecticidal soap (follow the instructions on the label).
Sprays will only kill the living mites, so you may have to repeat weekly spraying for a few weeks.
Click here for a short fact sheet on how to identify signs of mites.
Click here for a fact sheet on mealybugs.