PROC. ENTOMOL. SOC. WASH. 80(4), 1978, pp. 575-605 ADDITIONAL APHID-HOST RELATIONSHIPS AT THE LOS ANGELES STATE AND COUNTY ARBORETUM (HOMOPTERA: APHIDIDAE) Harry G. Walker, Manya B. Stoetzel and Leonid Enari Abstract. — This is the eighth report on collections of aphids from plants in the Los Angeles State and County Arboretum at Arcadia, California. About 140 species of aphids are listed with information on theii-host plants, date of collection and abundance. Aphids are plant feeders and many are efficient vectors of plant viruses. Information on the host plant relationships and distribution of aphids is becoming increasingly important. This is the eighth in a series of papers which contribute to the knowledge of the aphids and their host plants in the Los Angeles State and County Arboretum, Arcadia, California. As in three previous papers (Leonard et al., 1972; Leonard and Walker, 1973 and 1974), this one deals with a variety of aphids and their host plants. Four papers (Leonard et al., 1970, 1971a, 1971b and 1971c) dealt with six specific aphids and their host plants. Walker has been responsible for the collection of the aphids and Enari for the identification of the host plants. In this report, Stoetzel is respon-sible for the identification of some of the aphids and for help in the publication. In addition the authors would like to express their deep appreciation to the following for the identification of many of the aphids included in this report: R. L. Blackman (RLB), T. L. Bissell (TLB), C. S. Wood-Baker (W-B), V. F. Eastop (VFE), A. K. Ghosh (AKG), T. Kono (Kono), M. D. Leonard (MDL) deceased, R. J. Nielson (RJN), F. W. Quednau (FWQ), A. G. Robinson (AGR), C. F. Smith (CFS) and D. J. Voegtlin (DJV). Aphid, host plant relationships at the Los Angeles State and County Arboretum are given and include a list of the aphid, the host, the date of collection, the relative abundance of the aphid and the initials of the person making the aphid identification. Actjiihosiphon (Metopolophhwi) dirhodus Stereospermum kunthianum Cham. ( Walker ) 15/IX/69 Abundant ( W-B ) Bromus carinatus Hook. & Am. Acyiihosiphon pisum (Harris) 3/IV/71 Abundant ( CFS ) Acacia gillii Maiden & Blakely Acyrthosiphon pelargonii (Kaltenbach) 2/XI/67 Moderate (MDL) Pelargonium quercifolium Baum. Sophora tetraptera F. Mill. 24/XI/69 Moderate (AKG) 13/V/69 Scarce (AKG)
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