2006年安庆地区褐飞虱大发生特点及其原因分析

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。

Characteristics and reasons of the outbreak of the brown planthopper Nilaparvata lugens in Anqing in 2006

The main characteristics of the outbreak of brown planthoppers, Nilaparvata lugens St(a)l in Anqing in 2006 included large amount of immigrant pests with obvious immigration peaks, earlier occurrence of short-winged adults with large amount, rapid increasing of field population, great occurrence all over the city, breaking out in parts of city, and significant difference of population size among field patches. Based on the above, the main reasons of the outbreak of brown planthoppers were analyzed, which included abundant immigrant pest source as the foundation of the outbreak, the variation of biotypes of brown planthoppers, rich food conditions, the increasing planting area of single-harvest rice which provided good food and habitat conditions for brown planthoppers, and resistance of brown planthoppers to imidacloprid. It was also suggested to strengthen monitoring in different sites, monitoring insectiside resistance and field investigation.