Honestly I think battery-powered drones with hardened or screened props would have the best shot against locusts. One of the main vulnerabilities for aircraft

Honestly I think battery-powered drones with hardened or screened props would have the best shot against locusts. One of the main vulnerabilities for aircraft is the need to intake fresh air for combustion. This doesn't apply to drones. They also navigate using RF sensors and fly slow enough to avoid much collision damage. The locusts might start landing on them which could easily become incompatible with controlled flight, but that's the only thing that comes to mind.