褐稻虱生物型变异动态监测及抗虫品种资源推荐

本文报道近十多年来广东省褐稻虱Nilaparvata lugens(Stal)生物型变异动态监测的研究结果，针对当前褐稻虱优势生物型及发展趋势，推荐优良的抗褐稻虱品种资源。监测结果表明；根据苗期抗性反应，分蘖期生存率测定，田间系统调查监测，广州褐稻虱田间种群对带有Bph1抗性基因的代表品种IR26的致害力不断增强，1992年以来抗性反应达生物型2的水平。1992～1994年在全省7个不同生态类型地区取样测定及验证试验结果表明，生物型 2已上升为广东褐稻虱田间主害代的优势种群。多年的抗性鉴定结果证实，外引品种IR56、IR50404同其对应亲本PTB33、Babawee一样，对褐稻虱的抗性稳定，已推荐用作进一步抗 性育种的优良抗源。粳籼89等23个品种能抗褐稻虱生物型1和2，可及时替代带即BPh1抗性 基因的品种。

MONITORING THE VARIATION DYNAMICS OF BROWNPLANTHOPPER, NILAPARVATA LUGENS (STAL)BIOTYPES AND RECOMMENDING THE RESISTANTRICE CULTIVARS AND RESOURCES

The annual variation dynamlcs of brown planthopper (BPH) Nilaparvata lu gens (Stal) biotypes was monitored by seedling bulk test, nymph survival rate test in tiller ing stage and systematic observation in the field from 1979 to 1994. The suitable rice culti vars and resources against the current dominant population and developmental tendency of BPH biotypes were recommended. The results indicated the damage scale of BPH population in Guangzhou on the cultivar IR26 with resistant gene Bphl became higher and higher and reached the level of biotype 2 since 1992. Furthermore, the BPH biotype 2 had become the dominant population in Guangdong Province according to the tests with the population ex amples collected from 7 ecological localities and the verifying test from 1992 to 1994. The resistance to BPH of IR56 and IR50404 from IRRI as their resistant parent lines PTB33 and Babawee was high and stable according to the resistant tests for years. They have been rec ommended as the suitable and excellent resistant resources to BPH for further breeding. Twenty-three cultivars including Jing-Xian 89 resistant to the BPH biotype 1 and 2 can be used to take place of the cultivars with resistant gene Bphl in time.