Dear seemantinipathare,
I assume you have water bodies in your area and that is the reason for the snails. Please have a few ducks which will eat all the snails.
(Domesticated fowl—such as ducks, geese, or chickens—kept penned in infested areas can be effective snail predators that significantly reduce problems. Be careful, though, as these birds also can eat seedlings.)
Note: Request you NOT to use pesticides as they are harmful to the soil and other living organisms.
Regards
Padmanabhan Ganesan
