Such hosts remains heavily infested for about 6 weeks. Also, migration is not obligatory, the aphids being able to live on Euonymus throughout the year. Roots develop imperfectly and sugar content is lower. Aphids also spread to inflorescences of seed plants and hamper seed formation. Honeydew is produced and sooty moulds develop on it.
Growth is affected and flowers abort due to the action of toxic saliva.
Leaves are distinctly crinkled. . On the underside of a crinkled leaf. .