It was announced yesterday that the Innovative Vector Control Consortium (IVCC) will receive another 50 million USD to develop new public health insecticides. By 2020 it hopes to add three new active ingredients to the public health pesticide toolbox. That will then be a total of 100 million dollars for 3 new active ingredients. Finding new insecticides and bringing these to the market is an expensive business...
And of course, extensive use of chemical insecticides in mosquito control has caused a rapid spread of insecticide-resistance, which is threatening the effectiveness of current malaria interventions. Pretty obvious then that you start the search for new insecticides, so it seems.