On Gardener's Question Time someone asked whether the poem "if it's brown, squish it down, if it's black, put it back" was true, and I think it was Pippa Greenwood who said that wasn't really the case, it was more "if they're big, let them live, if they're small, squash them all".
A spot of googling informs me that:
Smallies (<4cm):
grey or brown (or black?) with a pale orange sole = Garden Slug = bad
distinct brown patches on side (I think these are the ones that look like snot?) = Field Slug = bad
Biggies (10cm+):
distinct ridge down back = Keeled Slug = bad but fairly uncommon
big brown or black thing (with or without red skirt) = Black Slug = doesn't really do much
big orange thing = Red slug = doesn't really do much
Then I had to find some pictures as generally they all look a lot like slugs to me.
Bad
Garden slug - http://www.habitas.org.uk/molluscire...hortensis2.jpg
Field slug - http://upload.wikimedia.org/wikipedi...eticulatum.png
Keeled slug - http://www.molluscs.at/images/weicht...l_cin600-1.jpg
Not so bad
Red slug - http://www.freewebs.com/worldofsnail...rionrufus2.jpg - "hi there!"
Black slug - http://bioref.lastdragon.org/Mollusc...02DSCF0163.jpg or http://www.english-country-garden.co...ack-slug-1.jpg
A spot of googling informs me that:
Smallies (<4cm):
grey or brown (or black?) with a pale orange sole = Garden Slug = bad
distinct brown patches on side (I think these are the ones that look like snot?) = Field Slug = bad
Biggies (10cm+):
distinct ridge down back = Keeled Slug = bad but fairly uncommon
big brown or black thing (with or without red skirt) = Black Slug = doesn't really do much
big orange thing = Red slug = doesn't really do much
Then I had to find some pictures as generally they all look a lot like slugs to me.
Bad
Garden slug - http://www.habitas.org.uk/molluscire...hortensis2.jpg
Field slug - http://upload.wikimedia.org/wikipedi...eticulatum.png
Keeled slug - http://www.molluscs.at/images/weicht...l_cin600-1.jpg
Not so bad
Red slug - http://www.freewebs.com/worldofsnail...rionrufus2.jpg - "hi there!"
Black slug - http://bioref.lastdragon.org/Mollusc...02DSCF0163.jpg or http://www.english-country-garden.co...ack-slug-1.jpg
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