Wipe Out Whiteflies

Whiteflies are small, triangular, white-bodied insects that love to take up residence on houseplants. They are an annoyance to plant owners and can cause the leaves of your plants to yellow and drop off.
Here are some control measures:

Use yellow sticky traps.
Use soap spray at five to ten day intervals.
Alcohol spray: 4 parts water to 3 parts rubbing alcohol. Add a squirt of liquid soap.
Remove and destroy all leaves that are more than 50% damaged.