宣州区近年二化螟发生特点及防治策略

[目的]研究分析宣州区1996~2010年二化螟发生特点,探讨最佳防治策略。[方法]利用宣州区近15年水稻二化螟历史资料,从种植制度、气候因素等方面进行分析。[结果]二化螟发生态势呈＂鐘＂形变化。1996~1999年种群数量提升期,2000~2004年快速发展期,2005~2007年发生程度快速下降期,2008~2010年为种群轻发期,但局部表现重发。种植制度的调整和栽培方式的变化是形成这一虫情特点的主要原因,气候因素引起这一总体趋势的局部震荡;氟虫腈等农药广泛使用是导致2005年后二化螟虫口数量快速下降的重要因素。[结论]二化螟的防治应采用以农业防治为基础、科学用药为重点的持续控制策略。

The Occurrence Characteristics and Control Strategies of Chilo suppressalis in Recent Xuancheng District

[Objective] The paper aims to study the characteristics of C.suppressalis in Xuanzhou District from 1996 to 2010,and an optimal control strategy was discussed as well.[Method] With the historical record of the occurrence of C.suppressalis in rice,it was analyzed in aspects of several factors,such as cultivation systems,climate condition and so on.[Result] Statistics showed that the occurrence of C.suppressalis formed a "bell" shape,the population size of it raised during 1996 to 1999,and it speeded faster in 2000 to 2004,whereas from 2005 to 2007,the pest-phenomenon declined drastically,and during 2008 to 2010,the pest phenomenon was much light in the global level,while locally,some heavy cases did exist.The chief reason for this phenomenon was the adjustment of cultivation method and its system.And local turbulence was attributed by climatic factors.The widely use of pesticide e.g.Fipronil led to the sharp decline of C.suppressalis population.[Conclusion] A kind of sustainable control strategies which based on agricultural prevention and focus on scientific application of pesticide should be used in future.