Be sure that you are using the right product for the insect you have. Don't spray your plant once and forget it, check every week of so for signs of the return of the bug. Any single pesticide does not usually kill all pests and repeat applications are usually necessary. When used properly most chemicals are tested and safe to use. The pesticides listed here as remedies have been in use for many years, and are considered as traditional in the nursery and greenhouse industries.
Aphids are common on house plant insects but fortunately, are easily controlled.
Aphids suck sap from the plant and can cause new growth to be stunted and distorted. Aphids may be just about any color and are found on new growth and the undersides of the leaves, usually clustered together in a group. Heavy infestations cover the plants with a sticky honeydew. If you can handle living with Lady bugs in the house, they will take care of any aphid problem for you. Aphids can also be controlled with malathion, diazinon, and systemic insecticides.