Identify the pest infesting the African violet. American cockroaches and thrips, tiny, yellow insects, are the most common chewing insects. Aphids, mites and mealybugs are typically responsible for sucking damage. If you are unable to identify a pest, take one to the county cooperative extension office in your area for identification.
Choose a pesticide labeled both for the particular pest and for use on African violets. Some of the harsher insecticides damage foliage.
Spray the African violet with the insecticide according to package instructions. You may need to reapply at particular intervals, so be sure to read the entire label.