tanglefoot

They never seemed to want anything, even at the sutler's store, though the Lord knows there wasn't much there they could want except tanglefoot and tobacco.

Instruments called "hopperdozers" were invented, which had receptacles filled with hot tar, and were driven over the ground to catch them as flies are caught with tanglefoot paper, and many millions of them were destroyed in this way, but it was about as effectual as fighting a Northwestern blizzard with a lady's fan, and they were all abandoned as useless and powerless to cope with the scourge.