稻秆蝇一代卵的田间分布型研究

Field Distribution Pattern of First Generation of Ricestem fly Ovum

对稻秆蝇一代卵在田间的分布型进行了初步研究。结果表明，一代卵在秧田呈聚集分布，分布的基本成分是个体群。根据Ｉｗａｏ（１９６８）方法拟合，确定理论抽样数及序贯抽样，其模型分别为：Ｎ＝（ｔ／Ｄ）２（１．３１３５／ｘ＋０．１２６）；Ｔ（Ｎ）＝（Ｄ２／１．４４７８）－１．１３·ｎ－０．

Field distribution pattern of the first generation of ricestem fly ovum was preliminarily studied. The result shows that this generation is distributed focusedly, and that the basic distribution element is individual. According to IWO's(1968)method, we determine the theoretical sampling number and sample to get the following model: N=(t/D) 2(1.3135/ +0.126) T (N) =(O 2/1.4478) -1.13 ·n -0.135