Some other natural insecticides I ran across:
1. A foliar spray of Water and Tabasco sauce with a little Safers soap
              (Capsicum extract and all vegetable soap)
               - Use at temps 80 degrees F or lower -
2.  Powdered Garlic applied to the roots  (systemic poison)  
            - Might work for Nepenthes probably will kill other CP's
-You can probably use extracts from Marigolds also.
Again you are on your own when trying these concoctions as I doubt they have
been tried very often on CP's.
Joe Roegner