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残存钉螺的分布情况及其原因:钉螺体积小,数量多,分布广,即使在比较平坦的滩面上,要使每只钉螺都能受到一种灭螺方法的处理也比较艰巨。五氯酚钠浸杀灭螺一般说可达此要求,因为用这种灭螺方法是制备成大量的水溶液,不仅滩面上的钉螺较易受到药物的处理,还能杀灭土下钉螺。但是滩面的高低不平、圩外边角地区、气温高低、浸泡的时间长短等因素,均可影响五氯酚钠灭螺的质量。全区据1975年春季复查有螺面积下降了96.7%。尚有3.3%的
The distribution of surviving snails and their causes: Snails small volume, large number, widely distributed, even in the relatively flat beach, to make each snail can be treated by a snail control method is more arduous. Sodium pentachlorophenate soaked snail generally can reach this requirement, because the use of this snail is prepared into a large number of aqueous solution, not only the snails on the beach are more susceptible to drug treatment, but also kill the soil snail. But the rugged beach surface, outside the corner area, the temperature level, soaking time and other factors, can affect the quality of pentachlorophenol sodium snail. According to the survey conducted in the spring of 1975, the area of snails dropped by 96.7%. There are still 3.3%