Bull World Health Organ. 1961;25(4-5):603-10.
Ecological measures for the control of Oncomelania quadrasi have been in effect over a large part of the municipality of Palo, Leyte, Philippines, since the end of 1956. These measures involve draining, ponding or filling snail habitats. The results show that complete eradication of the snails is possible where complete control of water is achieved; less radical measures always leave a greater or smaller fraction of the snail population.In the area where control was planned, reductions of 50%, 80% and 85.7% were observed by mid-year 1957, 1958 and 1959 respectively. The figures include four large snail populations not subjected to control measures, but within the planned area; if these are omitted, 95% of the snails had been eliminated by July 1959. The measures used are expensive, but result in benefits in land reclamation and improved land use sufficient to offset the high cost.
自 1956 年底以来，菲律宾莱特省帕洛市的大部分地区一直在采取控制钉螺的生态措施。这些措施包括排干、蓄水或填满蜗牛栖息地。结果表明，在完全控制水的情况下，完全消灭蜗牛是可能的；不那么激进的措施总是会留下更大或更小比例的蜗牛种群。在计划控制的区域，到 1957 年年中、1958 年和 1959 年，分别观察到减少了 50%、80%和 85.7%。这些数字包括四个未采取控制措施但在计划区域内的大型蜗牛种群；如果将这些数字排除在外，到 1959 年 7 月，95%的蜗牛已经被消灭。所使用的措施费用昂贵，但在土地开垦和改善土地利用方面带来的收益足以抵消高昂的成本。
