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.
They have hard shells and attach themselves to the stems or undersides of the leaves. Sprays are usually not effective since the shell protects the insects. Heavily infested plants should be discarded immediately.