Crapemyrtle Aphid
Nymph-Except for its smaller size and lighter pigmentation, the nymph resembles the wingless adult.
Host Plants -Crape myrtle is the only known host of this aphid.
Damage -The crapemyrtle aphid is the only significant insect pest of crepe myrtles in the Southeast. Because it feeds on the lower surface of crepe myrtle foliage, it is inconspicuous except for the copious amounts of honeydew that it excretes. A sooty mold, Capnodium sp., grows in the honeydew and thus alerts the grower to his aphid problem (Color Plate 3T). In addition to being unsightly, this black mold blocks light from the leaves. Because the foliage may drop prematurely, a plant can be in deplorable condition by midsummer. During some years, the aphid population may be kept in check by lacewings and ladybird beetles.
Life History -Very little information is available on the biology of the crapemyrtle aphid. In the Southeast, this pest is found on the foliage of crepe myrtles from late April through September. Winged and wingless forms are present during these months. Reproduction, the birth of living young, occurs especially during the summer season.
The sooner this aphid is discovered and treated in the growing season, the better. Pesticides should be directed against the bottom of the foliage. For specific chemical controls, see the current state extension service recommendations.