Well, I didn't try lavender oil. That's kinda for women so I bought a zapper. Actually 2 of them, the Ultimate Zapper XE and the Ultimate Zapper QE2. I got tired of doing the 20 minutes in between wait times of zapping so I bought the better QE2. The XE already got rid of most of my worm problems already. I'm using the QE2 to do the mopping up.