Abstract: According to the relation between zero specimen frequency(P0) and larva density(m) of Hydrellia sasakii investigated in the field, with the help of methods of population density estimation put forward by Iwao, Nachman, Gerrard, 5 formulae estimating larva density(m) of Hydrellia sasakii with the help of zero frequency(P0) were formulated: (1) P0=(0.896+0.023m)/m(-0.104+0.023m);(2) m=exp[0. 913ln(-lnP0) + 0.0258];(3)m=1.013(-lnP0)0.913;(4) m=1.019(-lnP0)0.924;(5) m=0.9999(-lnP0)0.971. In which, (5) formula was obtained using the theory value of formula (1) and (2) coordinated m=α(-lnP0)β. The comparison of estimation precisions and field application test, consistently shows that formula (5) estimation error was the minimum, precision was the maximum.

Key words: estimation method, Hydrellia sasakii, larva density

摘要： 比较了不同的稻茎毛眼水蝇幼虫密度估计方法，包括Nachman、Gerrard等5种方法的估计效果。

关键词: 稻茎毛眼水蝇, 种群密度, 估计方法