Humans use insecticides to protect their crops from parasites and to prevent mosquitos from spreading disease. As always, these human interventions have unintended consequences. Insecticides kill useful insects like bees, and parasites develop resistances against the chemicals. New methods are needed. Australian biologists published a new genetic biocontrol method: Transgenic male insects that produce neurotoxins in their reproductive tract which they transfer to females during mating. Life of the wildtype females is thereby shortened by up to 64%. Female mosquitos are the ones that feed on blood and spread diseases like dengue, malaria or yelllow fever. One implication that will be avoided is the spread of the toxic gene into other populations. A strong selection pressure works against this. But sure as hell there would be other unintended consequences if this "toxic male technique" would ever be introduced into the wild.