Are some varieties of tomato more susceptible to them?

Or do they like some varieties better than others?

I have 9 varieties of tomatoes planted.

3 Early Girl, 4 Celebrity, & 4 Big Boy.

One plant each of Solar Fire, Mortgage Lifter,

Black Prince, Golden Globe (I think)

Cherokee Purple and German Queen.

Thursday morning the Mortgage Lifter

was suddenly covered with Mealy Bugs.

(I say 'suddenly' because I check the plants

morning and evening,

& didn't notice a thing the night before.)

But there are no bugs on the surrounding plants,

Even where they are touching!

I've doused the bugs twice now

with Insecticidal Soap,

And there does seem to be fewer bugs,

But they aren't gone yet.

And still none on any other plants.

Is this a normal occurrence? ? ?

Rusty