Hello My Friend,
I had similar problem with lab lab (Avarai) and I used Neem Kernel extract and Emamectin Benzoate (This is a bio pesticide which is used at very low concentration. 5% EC - 100 ml per 100 liter spray solution) and now the larvae problem is very much under control.
You may also try Green Chilli + Garlic extract soaked in Kerosene (mixed with soap solution) which is an excellent instant pest remedy.
Wish you all the best.
Thanga Pandian, Farm India, Tel: +91-96260-08160