As I have posted already on this Forum, we have them here in Barbados. They are extremely destructive, and multiply very very quickly. To keep them away from my garden I have to be ever vigilant. This means, that at the slightest drizzle of rain after sundown, and again before sunup, I must arm myself with a pail of bleach, gloves, and torchlight, go into the garden and pick them up before they can get into the orchid houses. I have to constantly appeal to my neighbours (who really do not care their gardens as I do) to please treat their grounds by watering with Methaldihyde (spelling?).
In another post sometime this week, someone wrote about snails, they did not say what kind of snails, but said they were crushing them. With the Giant African Snail DO NOT DO THAT. They carry thousands of eggs and crushing them just leaves the eggs there in your grass or on the ground to start the cycle again. BTW I have been told that this snail is an Hermaphrodite, so having one snail present does not mean that there will be no eggs.!!!!