Flowers and the youngest leaves are wrinkled, distorted, and yellowing. On hot days the leaves may wilt and eventually drop off. A shiny, sticky substance often coats the leaves, which sometimes is covered with a black, sooty mold. Tiny ), yellowish-green or black soft-bodied insects cluster on the branch tips and the leaves. Ants may be present.
When aphids are first noticed, apply an insecticde labeled for these pests, or spray the plant with insecticidal soap.