1.   New herbicides have helped farmers control weeds, the principal reason for plowing.

2.   The company also wants to identify compounds that will provide the basis of new herbicides and pesticides.

3.   Agricultural chemicals grew six percent, helped by excellent performances in new herbicides.

4.   Colombian authorities urged to use a powerful new herbicide to eradicate illegal drug crops.

5.   Colombian authorities urged to use a powerful new herbicide on illegal drug crops.