ARC colony and ND colony were obtained by maintaining the whitebacked planthopper (WBPH), Sogatella furcifera Horv'ath, exclusively on ARC10239 (ARC, carrying resistance gene Wbph2) and N'Diang (ND, carrying resistance gene Wbph5) for 15 generations. Taichung Native 1 (TN1) and Rathu Heenati (RHT) were used as susceptible and resistant check respectively. The results of electronic monitoring showed that duration of salivation and X-waveform of the two colonies on their corresponding hosts was short while the duration of phloem ingestion was long. The results of virulence test indicated that: the amount of honeydew excreted by ARC and ND colony did not differ on their corresponding host varieties from TN1 and was much higher than that on RHT. The total number of eggs laid on their host varieties and TN1 were significantly higher than that on RHT. No distinct change was observed for these two colonies in the percentage of developed eggs. The nymph survival rate of ND colony on its selection host was 45.0%, significantly different from that on TN1(71.4%) and RHT(21 0%), while that of ARC colony was 68.3%, not significantly different from that on TN1(77.5%), but much higher than that on RHT(22.6%). The nymph developmental duration of these two colonies on the corresponding hosts was not different from that on TN1, but significantly shorter than that on RHT. In brief, these two colonies had almost adapted to their corresponding host varieties based on feeding and oviposition, but the nymph survival rate of ND colony was still low.
Chinese Journal of Rice Science