抗褐飞虱生物型Ⅱ水稻品种抗性稳定性研究

Studies on the resistance stability of rice varieties to Nilaparvata lugens Stal biotype II

1996～2002年调查桂引901、国粳4号抗褐飞虱的结果表明,在桂引901、国粳4号上褐飞虱的虫口密度均显著低于在当地主栽感虫水稻品种上,说明这两个水稻品种抗性稳定;监测褐飞虱生物型在广西南宁的变异动态,结果表明该虫均以生物型Ⅱ为优势种群,孟加拉型所占比率逐年上升,但上升的速度较慢。对该虫生物型的监测结果进一步反映桂引901、国粳4号的抗性稳定性。

The resistance of rice varieties, Guiyin 901 and Guojing No.4 to rice brown planthopper (BPH) , Nilaparva-ta lugens Stal) biotype II had been investigated since 1996. The results indicated that the BPH population sizes on Guiyin 901 and Guojing No. 4 were much lower than those on susceptible varieties which were widely planted locally. It means the resistance of these two varieties are stable. The dynamics of BPH biotypes were also monitored in Manning, Guangxi. The results indicated that the dominant biotype of BPH was biotype II,and the ratio of the biotype Bangladesh went up slowly year by year. The monitoring of BPH biotypes could tell the resistance stability of Guojing No. 4 and Guiyin 901.