Summary:

• **What is Dicamba?** Dicamba is a weed killer (herbicide) that the government has approved for use on certain crops that have been genetically modified to resist it. Genetically modified means scientists have changed the plant's DNA to give it special abilities, like surviving this particular weed killer.

• **Why This Matters:** Farmers can now use dicamba to kill weeds in their fields without harming their crops. However, scientists worry that dicamba can drift in the wind to nearby plants and hurt them, so there are concerns about how it might affect the environment and neighboring farms.