. Bulletin. Science. 42 SOUTHERN CALIFORNIA ACADEMY OF SCIENCES 100. AMDU ALCO ATCA ATCO HYSA LATR SUTO HOST SPECIES Fig. 3. Condition (live or dead) of the seven woody and subwoody host species infested with Cuscuta species in a Larrea-Athplex ecotone in the Amargosa Valley of southern Nevada. Host species abbreviations are explained in Figure 1. opmental stage) is also likely to determine the biomass and abundance of Cuscuta species. Mature or long-lived plants generally have a greater canopy size com- pared with juvenile or short-lived plants. Within the same host species, a relatively larg
. Bulletin. Science. 42 SOUTHERN CALIFORNIA ACADEMY OF SCIENCES 100. AMDU ALCO ATCA ATCO HYSA LATR SUTO HOST SPECIES Fig. 3. Condition (live or dead) of the seven woody and subwoody host species infested with Cuscuta species in a Larrea-Athplex ecotone in the Amargosa Valley of southern Nevada. Host species abbreviations are explained in Figure 1. opmental stage) is also likely to determine the biomass and abundance of Cuscuta species. Mature or long-lived plants generally have a greater canopy size com- pared with juvenile or short-lived plants. Within the same host species, a relatively large host canopy size would indicate a greater surface area available on second- ary branches for successful colonization and establishment of Cuscuta species. In this study, Cuscuta accumulated more tissue or biomass on those hosts that grew better and faster, presumably due to higher moisture content and nutritional value. Not all xerophytic plants functioned equally as hosts for multiple species of Cus- cuta in this study. Although water and nutrient availability were not quantitatively examined, infection of parasite on the host, as demonstrated by the higher prob- ability of infestation on Larrea and Atriplex spp. in comparison to Ambrosia, may be attributed to proportionally different water and nutrient uptake by these host plant species, or to different characteristics of the hosts and/or parasitic species. Host morphology and phenology were two main factors that partially deter- mined which species of Cuscuta parasitizing which species of host plants. Within the same host species in this study, species of Cuscuta tended to select individual hosts with greater height and canopy size. Seedlings appear to grow toward a source of high nutrient and, to a lesser extent, moisture (Kuijt 1969). Host mor- phology and phenology may be strongly associated with the availability of water and nutrients. Host preference in multiple species of Cuscuta are still not fully understood. Furth
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