稻茎毛眼水蝇幼虫密度估计方法的研究

Studies on Estimation Methods of Larva Density of Hydrellia sasakii

稻茎毛眼水蝇幼虫密度估计方法的研究秦厚国，叶正襄，李华（江西省农业科学院植物保护研究所，南昌３３０２００）关键词：稻茎毛眼水蝇；种群密度；估计方法ＳｔｕｄｉｅｓｏｎＥｓｔｉｍａｔｉｏｎＭｅｔｈｏｄｓｏｆＬａｒｖａＤｅｎｓｉｔｙｏｆＨｙｄｒｅｌｌｉａｓ...

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=ex[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.