Abstract: In the regions of treatment using Nosema Locustae in recent ten years,the percentages of infected grasshoppers by Nosema Locustae are 20%-80%,the infection exponents are 10%-41%.It was proved Nosema Locustae could spread in the population of grasshopper for a long time.After spraying,infection exponents showed stable trend with extending time.The infection exponents of Angaracris barabensis,Bryodema luctuosum luctuosoma and Dasyhippus harbipes were unstable in different years,it is difficult to establish infected populations in shorter period.But the proportion of Oedaleus asiaticus and Myrmeleotettix palpalis's infected population were stable relatively,after spraying Nosema Locustae for four years.It is important to improve controlling efficiency to grasshoppers using Nosema Locustae and control the grasshoppers below the level of economic damage.

Key words: Grasshoppers, Nosema locustae, Infection

CLC Number: 

• S433.2