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This study was designed to develop a microemulsion formulation of norcantharidin for the control of the diamondback moth (DBM),  Plutella xylostella  (Linnaeus), a notorious pest of brassica crops worldwide. The oil phase was screened and selected based on norcantharidin solubility while the surfactants were selected on the basis of their efficiency to form microemulsion. Optimized batches were selected using pseudo ternary phase diagrams. The microemulsion system were stabilized using mixtures composed of norcantharidin, surfactants (Tx13 and Tw80), and cosurfactant (ethanol). Its physicochemical characteristics were also demonstrated to have a higher cloud point than 72 °C as well as good thermodynamic and dilution stability. In additon, a subsequent insecticidal bioassay indicated that the acute LC 50  for norcantharidin microemulsion to  P .  xylostella  was estimated to be 12.477 mg/L (11.58–13.41, 95% CL). Our results provide an environment-friendly promising alternative to control  P .  xylostella  and possibly contribute to ameliorating any pesticide resistance in  P .  xylostella .

Microemulsion formulation of a new biopesticide to control the diamondback moth (Lepidoptera: Plutellidae)