Pest	Description	Harmful to humans	Harmful to snails	Cause	Remedy	Remarks
Fruitflies or gnats	Brown/black 3 mm	No	No	Old food	Remove old food immediately or change/bake substrate,pheramone or stick traps are available too	be careful with sticktraps and snails
Mites	White 1 mm	No	Not to healthy adult snails,but an infestation might be problematic to young snails	Seem to be naturally present on snails	Wash snails regularly or use predatory mites
Nematodes(plant parasitic)	White threadlike 5-10 mm	No,but see remarks	Not to adult snails,but an infestation might be harmful to newly hatched snails	Sometimes present in potting soil or houseplants	Change/bake substrate	The Rat lungworm is also a kind of nematode
Rat lungworm	threadlike 1.2 mm	Yes	No	Often present on wildcaught snails	Keep wildcaught snails in quarantine
Liver Flukes	Leaflike 30 x 13 mm	Yes	No	Often present on freshwatersnails(Lymnaea)	Careful with wildcaught freshwatersnails