2006年褐飞虱Nilaparvata lugens Stl大发生的特点主要有:迁入虫量大、回迁峰次明显;短翅型成虫发生早、虫口高;田间种群增长迅速,全市普遍重发,局部暴发;田块间虫口差异大。分析认为导致大发生的主要原因是:丰富的初迁虫源奠定了大发生的基础;褐飞虱生物型变化,食料条件丰富;单季稻面积扩大,从食料和生境2个方面为褐飞虱发生提供利好条件;褐飞虱对主治药剂吡虫啉产生抗性,促进褐飞虱暴发。还就加强异地监测、抗药性监测、田间调查等,提出建议。 The major occurrences of the brown planthopper Nilaparvata lugens Stöl in 2006 were as follows: the number of migratory insects was large and the peak of return was obvious; the short-winged adults occurred early and the height of insect population was high; the population in the field increased rapidly and the whole city was re-issued with local outbreaks; Large difference between the population of insects. The main reason for the occurrence of large-scale occurrence is as follows: rich initial migratory larvae laid the foundation for large-scale occurrence; the brown planthopper biotype changed and foodstuff conditions were abundant; the area of ​​single-season rice expanded, providing good conditions for the occurrence of BPH from two aspects of foodstuff and habitat; Nilaparvata lugens resistance to the host agent imidacloprid, and promote the outbreak of brown planthopper. Also to strengthen off-site monitoring, drug resistance monitoring, field surveys, etc., make recommendations.