What i have found works best is to buy a pack of American spirit cigarettes (No additives) and remove all of the tobacco, add to a quart of water and simmer for about a half an hour. Then add 1/2 quart of water (Phed of course) and spray under and all over leaves and plant. (Store leftover liquid in fridge)

Tried Neem Oil for weeks with almost no affect but this solution killed them the first time!! Voila~ it was like a miracle. see what others think but thats what worked for me and i had them bad!!

Commercial greenhousemen are very familiar with nicotine based insecticides. They are also natural and organic.

Good luck!