ClipArt ETC
The Canfield pan was a simple and effective locust extermination device. A flat pan was filled with coal tar or kerosene, and dragged over the surface of a locust infested field. Locusts would panic and jump into the pan, falling into the kerosene/tar, and die.

Canfield coal-oil pan

The Canfield pan was a simple and effective locust extermination device. A flat pan was filled with…