近来各地已有一些关于钉螺残存原因分析的报道,内容多着重于查螺质量、螺区大小、密度高低、间隔几年再现等方面分析。为了进一步研究解决山丘地区钉螺残存的问题,作者在血防工作做得比较好的县内,选择部分螺情下降慢的村作钉螺残存原因调查分析,并探讨技术方面提出初步的解决方法,现报告如下。 Recently, there have been some reports about the causes of snail remnants in various places. The contents mainly focus on the quality of snail, the size of snails, the density, and the reproduction in a few years. In order to further study and solve the problem of snail remnants in hill areas, the author selected some villages where the snail population slowed down as the reason for surviving the snail in the prefectural county where blood and air defense work was done well, and discussed the preliminary solutions to the technical problems. The report is as follows.