Seedlings eaten up by worms!

My poor seedlings are being eaten up by worms! For the recent weeks, the plots are invaded by worms! We wonder why this is so! Every day, I caught at least 5 worms .. Yucks! It zapped my energy every time I see one and had no choice but to remove & kill them! Sigh... indeed demoralising as a farmer to see your crops destroyed in this way!