Virulence of Sogatella furcifera field populations to rice varieties:A determination with electronic monitoring system
运用电子记录技术检测白背飞虱田间种群致害性

With electronic monitoring system (EMS) and honeydew measurement, this paper determined the virulence of Sogatella furcifera field populations in Fuyang County of Zhejiang Province and Changfeng County of Anhui Province. The results showed that in the three EMS recording periods (2, 4 and 6 h), the ratios of phloem ingestion duration to susceptible rice variety TN1 (check) and highly resistant variety RHT were relatively stable. Two hours duration was defined as the shortest period to detect the virulence of S. furcifera field population by EMS. The amounts of honeydew excreted by S. furcifera field population on rice varieties N22, ARC, ADR52 and ND in Fuyang County, which carried the dominant resistance gene Wbph 1, Wbph 2, Wbph 3 and Wbph 5, respectively, were not significantly different from each other, but significantly lower than that on TN1. The durations of phloem ingestion on ARC and ADR52 were not significantly different, but significantly shorter than that on TN1. For the field population in Changfeng County, the amounts of honeydew excreted by S. furcifera did not differ significantly on N22 and ARC or on ADR52 and ND, but the honeydew on the former two rice varieties was significantly more than that on the latter two. The duration of phloem ingestion on ADR52 (22.3 min x 2 h(-1)) was significantly shorter than that on ARC (49.8 min x 2 h(-1)). Therefore, the virulence of S. furcifera field population in Fuyang County had no changes, whereas in Changfeng County, the population showed a definite adaptation to N22 and ARC, displaying the trend of virulence shift. Electronic monitoring system provided a new means for rapidly and accurately detecting the virulence and monitoring its change of S. furcifera field population.