If I remember correctly, it's female mosquitoes that are the problem, last I heard, there may be pheromone based methods of convincing the females to (a) not breed as voraciously and (b) convincing them not to bite humans. Whilst that method may take effort on the part of humans when working near mosquitoes, such as sprays etc, it's probably ecologically less risky than culling them.
The real problem in much of the world is the fact that there are already protections developed, but they simply are not available, or are too expensive to have any real impact on the local population, my own suspicion is that the answer to the Malaria problem is a human-centric, not mosquito-centric one.
Edit: I also seem to recall another problem in that there are now breeds of mosquito that are immune to the usual pesticides, because they are the offspring of those that have survived generation after generation of being sprayed with it.