河北棉铃虫疾病发生及流行的田间调查

Field Studies on the Occurrence and Epidemiology of Entomopathogenic Diseases Infecting Helicoverpa armigera in Hebei

１９９５～１９９７年在河北省邯郸、衡水、保定３个市对１～４代棉铃虫幼虫进行了调查，结果表明：能够抑制棉铃虫种群数量变动及导致疾病发生与流行的主要病原菌种类有病毒，包括核型多角体病毒、质型多角体病毒和颗粒体病毒；细菌为苏云金杆菌；真菌有绿僵菌和白僵菌。因感病致死的棉铃虫视年度、世代不同而差异显著，平均死亡率为２１．１％，高的可达５７．１％。研究还表明：棉铃虫疾病的发生及流行与宿主种群、病原菌种群及环境因素关系密切。

Field survey was conducted on the entomopathogenic diseases infecting Helicoverpa armigera in 3 localities of Hebei, 1995-1997 The results showed that the main pathogenic organisms were HaNPV, HaCPV, HaGV, Bacillus thuringiensis, Metarhizium anisopliae and Beauveria brongniartii  The rate of control of H armigera by these organisms varied greatly with year and generation of the insects The average mortality of H armigera was 21 2% and could reach as high as 57 1% in an epidemic year It was found that the occurrence and prevalence of diseases was influenced by population of H armigera species of pathogen and environmental factors