Damage symptom on cucumber plant
The HI lineage with no feeding experience on pre-infected cucumber developed into tiny yellow dwarfs. The HI lineage with feeding experience (HI adapted) on pre-infected cucumber reached the same population growth rate as the CU lineage on healthy cucumber plant, and the nymphs developed into big green morphs which had no discernible difference from the CU lineage on cucumber plant. The HI lineage with feeding experience (HI adapted) on pre-infected cucumber inflicted the same damage symptom as the CU lineage did to cucumber plant, and the HI lineage with no feeding experience on pre-infected cucumber inflicted no damage symptom to cucumber plant (Figure 1D). The results indicated the HI lineage fully adapted to cucumber through the short feeding experience on pre-infected cucumber.