论文部分内容阅读
麦鞘毛眼水蝇在川、甘、陕、青等地发生普遍,为害较重。每年春季和秋季各发生一代,以幼虫蛀入小麦叶肉内,沿叶片基部转移至叶鞘危害,吃去叶鞘组织、使叶片枯黄,一般损失产量10—15％。目前,预测该虫的防治时期,常常以百株或丛卵量为指标。弄清麦鞘毛眼水蝇卵的空间分布型,确定合理的取样数量,具有十分重要的意义。为此,1985年春我们对麦鞘毛眼水蝇卵的分布型进行了调查,现将结果概述如下。 一、分布型的测定 1.调查方法 采用分层随机取样法,在3月下旬麦鞘毛服水蝇产卵盛期,选不同地势、不同播种密度、不同施肥水平、不同品种的迟播小麦田共5块(田块面积在1亩以上),每块田根据小麦长势又划出10个样区,每区内随机取样10个点(每点15株),分株记载各叶片上麦鞘毛眼水蝇卵(包括卵壳数)的数量。其结果整理见表1。
Mallard eye water flies in Sichuan, Gansu, Shaanxi, green and other places common, more serious damage. Each spring and autumn each generation a generation of larvae bored into the wheat leaf, along the leaf base transferred to the sheath damage, eat leaf sheath tissue, the leaves yellow, the general loss of yield of 10-15%. At present, the prediction of the pest control period, often with hundreds of eggs or clusters as an indicator. It is of great significance to understand the spatial distribution of Ophiopogon japonicus eggs and determine the reasonable number of samples. Therefore, in the spring of 1985, we investigated the distribution patterns of Flies in Ophiopogon japonicus, and the results are summarized as follows. First, the distribution of determination 1. Survey method stratified random sampling method, in late March Maofu Mao water flies ovipositing peak selection of different topography, different planting density, different fertilization levels, different varieties of late sowing small A total of five wheat fields (plots in an area of more than 1 acre), each field according to the wheat growing again draw 10 plots, each area randomly sampled 10 points (15 points per point), ramets recorded on the leaves of wheat Sheath Flies ova eggs (including the number of eggshell) number. The results are summarized in Table 1.