Mealys can be tough to erradicate. They have a waxy covering which tends to repel liquids. Systemic insecticides and some house plant insecticides are sometimes effective, but be certain that it is appropriate to use them on ivies. Always read the entire label of any pesticide or other chemical, and only use when it is absolutely necessary. You must be vigilante in rechecking your plants every 2 weeks or so to be sure that you have eliminated every trace of these bugs or you will quickly be facing the problem all over again.
Aphids are small flea size insects which suck plant juices.
They are usually found at the leaf axis or stem tips. A serious infestation will coat the leaves with sticky honeydew, which may then develop a black, sooty mold. The insects can be green, white, pink or black, and are often accompanied by ants who farm them. They are easily controlled with diligent use of rose dust or other suitable commercial remedies. Scale are usually light brown or tan.