We are beginning to see the build-up of crapemyrtle aphid on crape myrtles on the North Carolina State University campus. Aphid populations can explode within a week. If you have crape myrtles that consistently have a problem and have severe sooty mold, watch for these pests. Problems will become more noticeable throughout the summer. For more information on crapemyrtle aphids, see Ornamental and Turf Insect Note No. 31, which is available on the web at: http://www.ces.ncsu.edu/depts/ent/notes/O&T/shrubs/note31/note31.html.
From Dr. Stephen Bambara (NCSU Department of Entomology)
For more information contact your local Cooperative Extension Center and ask for the Commercial Horticulture Agent.