常德稻区螟虫种群发生危害规律演变的研究

[目的]研究常德稻区螟虫种群的发生危害规律。[方法]通过对常德地区1956～2006年螟虫种群发生危害程度及规律资料进行分析,研究其危害规律的演变过程。[结果]常德稻区螟虫发生危害1957年之前以二化螟为主,1958～1969年以三化螟为主,1970～1986年三化螟、二化螟混合大发生,1987～2001年以三化螟为主,2002～2006年以二化螟为主。螟虫发生危害规律变化主要受桥梁田、有效越冬虫源田面积,水稻播期、品种和栽培方式及防治农药品种的变化的影响,使三化螟和二化螟经历了从次要害虫上升为重要害虫、混合大发生或相互交替变动的演变过程。[结论]该研究为常德稻区螟虫的防治工作提供了参考。

Study on the Evolution of Occurrence and Damage-Law of Stem Bore Population in Changde Rice Area

[Objective] The purpose was to study the occurrence and damage law of stem borer population in Changde rice area.[Method] Through analyzing the data about the occurrence and damage degree and law of stem borer population in Changde area in 1956-2006,the evolution course of its damage law was studied.[Result] Chilo suppressalis was the chief in the occurrence and damage of stem borer in Changde rice area before 1957 and in 2002-2006 and that of Scirpophaga incertulas was the chief in 1958-1969 and 1987-2001,and the mixed outbreak of C.suppressalis and S.incertulas occurred in 1970-1986.The change of the occurrence and damage law of stem borer was mainly affected by the areas of bridge field and effectively overwintering pest origin field and the changes of rice sowing date,variety,cultivation mode and controlling pesticide kinds.These factors made C.suppressalis and S.incertulas go through the evolution course of ascending from secondary pest to main pest and mixed outbreak or mutually alternative variation.[Conclusion] The study supplied reference for the controlling work on stem borer in Changde rice area.