2,4-D

2,4-D, the first effective chemical herbicide, was introduced. It selectively eliminates broad-leaved plants without seriously affecting grasses and grains.
 Judah Hirsch Quastel England 1944 2,4-D

2,4-D, the first effective chemical herbicide, was introduced. It selectively eliminates broad-leaved plants without seriously affecting grasses and grains.