Aphids are tiny insects about a 1/16 to 1/8 inches long, usually light green, red or black. They come in the spring and damage tender new growth.
A hard spray of water from the hose will help remove aphid infestations. Aphids reproduce quickly and this may need to be repeated every couple days for a couple weeks.
Aphids have a mutually beneficial relationship with ants, so ants need to be controlled if aphids are to be controlled. Ladybugs are a natural predator of aphids and can be used to control aphids. If ladybugs are purchased, water the area well and release the ladybugs around sunset to discourage them from leaving.