So this is interesting. Today I was trimming off excess buds on a fig that I completely defoliated a few weeks ago. I pealed back an area of cut paste to reveal a nest of mealy bugs. So I took the paste off another area and another nest, and so on and so forth until six separate nests of mealy bugs were revealed.
Mealy Bug infestation under bonsai cut paste
Matt's Bonsai Blog 