Can nerve agents target specific genetic traits? I don't recall that being a feature when I learned about them in the military. IIRC nerve agents will destroy the nervous system of just about all living things and remain a risk in the environment until they have been broken down.

I use a simple nerve agent to get rid of flies. Permethrin is a sodium channel blocker that causes an overload of the CNS. Insects and very young mammals with under-developed livers can not metabolize it. So I suppose that targets a class of living things but I can not target specific breeds of flies with it. If I could then Botflies would be target numero uno.

The latest James Bond touches on these frontier issues in nanotechnology

Nerve agents disperse.

And these require a lipid shielding, so fats. That is not going to last long in the air at all, making these probably bad aerosol-sized weapons.

Dirty bomb fallout doesn’t