Claude,

Ditto Bob's advice, but I will add this: Repot, and spray the entire plant
with alcohol (soap added) before putting into the new medium. It's a good
bet that you'll find the mealies in the pot as well, and even if you can't
see any there are probably immature beasts in there. Sterilize the pot
before using again, and treat the plant again in 5-7 days, just to make sure
you get the leftovers. Keep a close eye on nearby plants.

Diana