Host specialization of the HI and CU lineage
Life span of the HI lineage on cucumber reduced by 40.59%, and reproduction of it reduced by 84.10%, compared with that on cotton (Figure S1A). Nymphs of the HI lineage developed into tiny yellow dwarfs on cucumber which were largely different from the dark green morphs on cotton (Figure S1C). The CU lineage on cotton survived for 19.54% less time and produced 75.81% less nymphs than on cucumber (Figure S1B). The adults of the CU lineage grown on cotton were not much different from those grown on cucumber in morphology (Figure S1C). The results confirmed that the HI lineage and the CU lineage were highly host specialized. According to body development on novel hosts, the HI lineage had a higher level of host specialization than the CU lineage.