【摘要】 野外抗性家蝇的测定与调查,目前还存在着不少问题:(1)在重点防治区的家蝇群体,由于受连续不断的化学防治与机械防治及非防治区迁飞的影响,该区家蝇群体抗性的分布不一定是常态分布;(2)用点滴法来测定抗性较高的家蝇,尚有一定的困难。这样必须发展一些新的方法,来适合当前的需要。作者提出用大样本-低浓度连续喷射法作为测定野外家蝇群体抗性的依据,并且提出以变异系数来比较不同地区家蝇群体抗性分布的变异情况;用抗性系数及抗性相对倍数来比较它们的抗性强度。 根据室内培育的抗性家蝇品系与野外典型地区的家蝇群体抗性分析的结果,证明所采用的大样本-低浓度连续喷射法,合乎客观情况,可作为野外调查家蝇抗性的有效方法。从实践证明,重点防治区域的家蝇群体抗性,根据抗性曲线的分布,可分为三个类型:(1)防治中心区,(2)防治中间区,(3)防治边缘区。防治中心区与防治中间区的家蝇群体抗性的分布很不规则,离常态分布较远。更多还原

【Abstract】 In consequence of chemical and mechanical controls and dispersion of the house-flies(Musca domestica vicina), the distribution of resistant house-flies in the main control areais not normal. Moreover, there are some difficulties in assaying the resistance of high-resistant strains by means of the topical application method. Therefore, it is necessaryto develop some new method for testing and comparing the resistance of resistanthouse-flies from different areas. Experiments show that the large sample-low dosagecontinuous spray technique, using the coefficient of variation and coefficient of resistancefor comparison, seems to be a satisfactory method at present for this purpose. The co-efficient of resistance is calculated by the summation of the products of the relativestrength of the resistance and the percentage of mortality for each spray. Actually, inapplication of this method in the main control area, three types of distributions may bedistinguished, the center type, the intermediate type and border type.更多还原