secondary host plants definition
secondary host plants means hosts of the lettuce aphid asexual form and includes liguliforous and latex Asteraceae (Compositae) (set out in Schedule 10), including Cichorium spp. (chicory), Cichorium endivia (endives), Cichorium intybus (chicory), Crepis spp. (hawk’s beard), Hieracium spp. (hawkweed), Lactuca spp., Lactuca sativa (lettuce), Lapsana spp. (nipplewort), Leontodon taxacacoides (hawkbit), Nicotiana spp. (tobacco), Petunia spp. (petunia), Scrophularia spp. (figwort) and Veronica spp. (speedwell).