Since 1955 snails of the Euglandina rosea species complex and Platydemus manokwari flatworms were widely introduced in attempted biological control of giant African snails (Lissachatina fulica) but have been implicated in the mass extinction of Pacific island snails. We review the histories of the 60 introductions and their impacts on L. fulica and native snails. Since 1993 there have been unofficial releases of Euglandina within island groups. Only three official P. manokwari releases took place, but new populations are being recorded at an increasing rate, probably because of accidental introduction. Claims that these predators controlled L. fulica cannot be substantiated; in some cases pest snail declines coincided with predator arrival but concomitant declines occurred elsewhere in the absence of the predator and the declines in some cases were only temporary. In the Hawaiian Islands, although there had been some earlier declines of native snails, the Euglandina impacts on native snails are clear with rapid decline of many endemic Hawaiian Achatinellinae following predator arrival. In the Society Islands, Partulidae tree snail populations remained stable until Euglandina introduction, when declines were extremely rapid with an exact correspondence between predator arrival and tree snail decline. Platydemus manokwari invasion coincides with native snail declines on some islands, notably the Ogasawara Islands of Japan, and its invasion of Florida has led to mass mortality of Liguus spp. tree snails. We conclude that Euglandina and P. manokwari are not effective biocontrol agents, but do have major negative effects on native snail faunas. These predatory snails and flatworms are generalist predators and as such are not suitable for biological control.

自1955年以来，在试图对非洲巨型蜗牛（Lissachatina fulica）进行生物防治的过程中，广泛引入了Euglandina rosea物种复合体的蜗牛和Platydemus manokwari扁虫，但它们与太平洋岛屿蜗牛的大规模灭绝有关。我们回顾了60种引种的历史以及它们对L. fulica和当地蜗牛的影响。自1993年以来，岛群内有非官方的Euglandina释放。仅发生了3次正式的Manokwari疫情释放，但新种群的记录在增加中，可能是由于意外引入。声称这些捕食者控制了褐紫苏无法得到证实；在某些情况下，害虫蜗牛的下降与捕食者的到来相吻合，但是在没有捕食者的情况下，伴随而来的其他地方的蜗牛数量下降，而在某些情况下，下降只是暂时的。在夏威夷群岛，尽管本地蜗牛的数量有所下降，但随着掠食者的到来，许多地方性夏威夷Hawaii科动物的迅速下降，使欧兰迪纳对本地蜗牛的影响显而易见。在社会群岛中，Partulidae的树蜗牛种群一直保持稳定，直到引入Euglandina为止，其下降速度非常快，捕食者的到来与树蜗牛的下降之间存在确切的对应关系。桔梗入侵恰逢某些岛屿（特别是日本的小gas原群岛）上的本土蜗牛数量下降，并且其入侵佛罗里达州导致利古斯菌大量死亡。蜗牛。我们得出的结论是，Euglandina和P. manokwari不是有效的生物防治剂，但确实对本地蜗牛动物群具有重大的负面影响。这些掠食性蜗牛和扁虫是通体捕食者，因此不适合进行生物防治。