论文部分内容阅读
单季晚粳秧苗期避开灰飞虱迁移高峰期,将会减轻条纹叶枯病发生程度,是一项有效的“绿色防控”技术措施。采用分期播种的方法,研究了单季晚粳播种期对灰飞虱虫口密度、水稻条纹叶枯病发病率影响。结果表明,单季晚粳播种期对灰飞虱虫口密度、水稻条纹叶枯病发病率影响明显,随着播种期从5月中、下旬推迟到6月上、中旬,田间灰飞虱虫口密度明显下降,水稻条纹叶枯病始病期、发病高峰期明显推迟,发病高峰次数减少,发病率显著降低,水稻有效穗数增加、结实率提高,增产效果明显。结合考虑第1代灰飞虱成虫迁移高峰期和水稻安全齐穗期,建议在江淮南部的水稻条纹叶枯病重发区,单季晚粳播种期推迟到6月9～14日。
It is an effective “green control” technical measure to avoid the occurrence of stripe blight in the single season late Japonica seedling stage to avoid the peak of the migration of the SBPH. The method of staged sowing was used to study the effects of single-seeding late japonica sowing date on the population density of S. japonica and the incidence of rice stripe virus. The results showed that the sowing date of single season late japonica had a significant effect on the population density of S. japonica and the incidence of rice stripe virus. As the sowing date was postponed from mid-May to late June, The incidence of rice stripe leaf blight was significantly delayed, the peak incidence was significantly reduced, the incidence peak frequency was reduced, the incidence was significantly reduced, the effective panicle number increased, the seed setting rate was increased, and the yield increase was obvious. Considering the migration of the first generation of Laodelphax striatellus and the safe heading stage of rice, it is suggested that the sowing of single season late japonica rice be postponed from June 9 to June 14 in the recurrent area of rice stripe disease in southern Jianghuai.