 Mosquitos can evolve quickly so it becomes a balancing act of killing them before the "Plasmodium" they carry becomes the infectious disease, but not so fast that they become resistant to the fungi.By genetically engineering fungi like "Metarhizium anisopliae" and "Beauveria bassiana" to delay the development of mosquito infectiousness the selection pressure to evolve resistance is reduced.Another strategy is to add proteins to the fungi that block transmission of malaria or remove the "Plasmodium" altogether.