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Background  In this semi-field study, a new polymer-enhanced deltamethrin formulation, K-Othrine ®  PolyZone, was compared to a standard deltamethrin product for residual activity against a susceptible strain of laboratory-reared  Anopheles gambiae  using standard WHO cone bioassays.    Methods  Residual insecticide efficacy was recorded after exposure to metal, cement and wood panels maintained in experimental huts in sub-tropical environmental conditions in north central Florida, USA, and panels stored in a climate controlled chamber located at the Centers for Disease Control and Prevention, Georgia, USA.    Conclusions  K-Othrine ®  PolyZone demonstrated 100% control on metal and cement panels 1 year post application and > 80% control on wood panels up to 6 mo. The new formulation should be considered for use in indoor residual spray programmes requiring long-term control of malaria vectors.    Electronic supplementary material  The online version of this article (10.1186/s12936-018-2239-z) contains supplementary material, which is available to authorized users.

Evaluation of the long-term efficacy of K-Othrine® PolyZone on three surfaces against laboratory reared Anopheles gambiae in semi-field conditions