The primary effective ingredient in standard Vendetta and Vendetta Plus are the same. The Plus version, though, includes the addition of Nygard IGR, a growth regulator that when ingested and shared among insects will help impair the development of future generations of roaches as they will not reach full maturity and will therefore not mate efficiently.
This is a common technique with professionals mixing sprays, in which a strong, immediate "knockdown" pesticide may be mixed with another pesticide that has a strong "residual" effect for weeks or months, add in a "booster" (such as ExciteR or Kicker, with Piperonyl Butoxide) to enhance the efficacy of the pesticides, along with an IGR (Nygard, Precor, Gentrol, etc) to regulate insect growth & development.
